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What is Sea Level?

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FREE FACT: An oblate spheroid is a special case of an ellipsoid where two of the semi-principal axes are the same size. A special thanks to our Subbable.com supporters: Robby Weisenfeld Gustav Delius Ike https://www.youtube.com/TheNilFacts And to Audible.com - FREE audiobook at http://www.audible.com/minutephysics MinutePhysics is on Google+ - http://bit.ly/qzEwc6 And facebook - http://facebook.com/minutephysics And twitter - @minutephysics Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute! Music by Nathaniel Schroeder http://www.soundcloud.com/drschroeder Thanks to Nima Doroud for contributions. Created by Henry Reich
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Text Comments (2820)
gtgene (1 day ago)
Well the good news is that there are Geodesists who take care of these details so that we don't have to.
Neeraj Nandan (3 days ago)
Marvel Bound (6 days ago)
this made me wanna believe flat earthers......then I stopped hitting the pipe I'm good now
helena (11 days ago)
mount everest is 8488 meters not 8850 meters
Lester Cabillan (14 days ago)
according to NASA earth is PERFECT CIRCLE, look at their blue marble.
God damn Bullshit.
Nikki Wooden (17 days ago)
I can't tell if I'm too high or not high enough to process this, but it's fascinating and much appreciated! Thanks for the education!
Soo satisfying!
Mckenzie Welsh (18 days ago)
It is an oblong spheroid
Eyal atiya (1 month ago)
Wow so much bullshit amazing
Sarmad Saeed (1 month ago)
And yes also include; _____earth rotates, spins, tilts , all seven sea has different levels, there is air & space, different temperature, ice melting, seasons_____ consider all these things and then see what is the sea level of your area from google earth or Wikipedia. Earth is a global village and villagers can see anything never mind.
Malaysian08H (1 month ago)
So I would simply say “Its completely complicated”.
Charles Pemberton (1 month ago)
If you set two large posts at the same height above the sea, one in Australia and one in California, and built a bridge connecting the two, the middle of the bridge would need to be set at the same height above sea level in order for the bridge to be level. Proof that Earth's water always Finds Its level. And proof of Flat Earth.
Art Vandelay007 (1 month ago)
Charles Pemberton // Your conclusion is wrong because your premise is false (and impossible). A bridge of that length with only one support at mid-span would cause that bridge to dip into the water over 99% of its length. The bridge would require support piers at regular intervals underneath it's entire length so no portion would sink into the water. The height of each pier would be dependent on how deep beneath the ocean floor you would need to dig before striking bedrock for a solid footing, plus the mean local sea level at that point, and repeat for all support piers. This method would then account for the curvature of the Earth, as well as for changes in elevation along the sea floor.
You could have used 7 minutes to make this video instead of 3. It's so fast that I have to pause and ponder upon the facts that you state. Anyways, very interesting information.
Derpy the Cookie (1 month ago)
Oval beat them all
emilstnt (2 months ago)
1:12 bro is that deadass algodoo?
Carolyn Gutman-Dey (2 months ago)
This is utter bullshit. Please, everyone watching this RESEARCH FLAT EARTH. Earth is NOT a sphere, an oblate spheroid, or anything curved. (There IS a "circle of sight" that surrounds each of us 360 degrees. Don't confuse that with a ball. Do not conflate sphere and circle! ) THERE IS NO CURVE OR SPIN. There is no ball earth, it is just in the human mind. Published science shows NO SPIN. So much so they had to invent relativity in order to hide the NO SPIIN evidence! But don't believe me, of course. Do your own research. Save your sanity. Do you like science? You will love flat earth. Do you hate science and think it is confusing? Well, discover REAL science: RESEARCH FLAT EARTH. It takes some time, and you must put aside your ego for at least a few hours, but it is worth it!
Art Vandelay007 (1 month ago)
Carolyn Gutman-Dey // I feel very sorry for you and others who believe in this false Satanic Flat Earth doctrine. Someone has sold you a bill of goods, and you have bought into it hook, line, and sinker. Just think about how ridiculous you sound. All of the greatest scientific minds throughout history are wrong, and you are right? You should be ashamed of yourself...
Silly Billy (1 month ago)
The sad part is, you aren't troll, yet you damn sure are acting as such. The earth is a globe
suman vishwakarma (2 months ago)
It's affect the tide?
MAVEN FELICIANO (2 months ago)
LOL @1:49. Curved level? 😂
Civil User (2 months ago)
As..you told regarding the height of water around the mountains..that.. around mountains there will be more gravitational force and hence higher sea level..then..why isn't there any sea around the Himalayn mountains? Please clarify my doubt.
Jose Barrios (2 months ago)
I left more confused than I entered..
00x000 (2 months ago)
Thanks for the easy explanation!
The26 (3 months ago)
0:19 take that flat earthers learn from this
Silly Billy (1 month ago)
oh shit, they are here
Zachary Hill (3 months ago)
1:49. - so incorrect.
Jahsher Sha (3 months ago)
Wtf?? Weak gravity??How do you measure gravity?
00x000 (2 months ago)
With a Gravimeter and that's no joke. Earth’s crust has different density in different locations and at different depths. The density of the crust is determined by the type of rocks that make up that area.
NANU Rajput (3 months ago)
I like this video👍👍👍
NANU Rajput (3 months ago)
I like this video👍👍👍
NANU Rajput (3 months ago)
I like this video👍👍👍
BADAL NARGAVE (3 months ago)
Bhaii jaldi me he lagta he...
channel 2 (3 months ago)
Didn't understand it, bruh. You included math, that's why.
tommaX1324 (3 months ago)
I get what you were trying to say, but thats a bit exagirated potato earth shape.
celeste3100 (4 months ago)
this gave me no answers, just more questions.
Fred Gilbert (4 months ago)
Level means Level this is so much BS I do not like these paid liars.
elOx (4 months ago)
0:25 flat-earthers triggered
randomhalofan292 (4 months ago)
Our Earth ain't a potato!
telugu viral (4 months ago)
Why anybody chasing you
coolgal 12 (4 months ago)
I still don't get it 😭
diego lara (4 months ago)
What kind of education is this?🤦‍♂️😒 In no way this video is even close to 1% accurate nor proves any proofs of what he’s talking about. Wake up people, level does not mean curve, nor bent, nor twisted it means STRIGHT. Look up a construction level stick and let that sink in🚽👉🧠
Art Vandelay007 (1 month ago)
diego lara // The air bubble in a carpenter's level can be used to indicate a level condition because liquid is not affected by the curvature of the Earth over such short distances. Large bodies of water such as lakes, seas, and oceans are a different story altogether. The waters are constantly in turmoil, always sloshing about in all directions, always trying to seek level, but they NEVER do. Mean Sea Level (MSL) means just that, it's an "average" of varying sea levels measured at a specific location. "Sea level" exists solely as a baseline or datum from which land elevations (above or below) can be taken.
Dante van Gemert (5 months ago)
0:41 42!?
Giovanni Pezzino (5 months ago)
Wait mass attracts more mass on earth as well? I thought it had to be something much bigger, I thought that tectonic plates move because of conventional currents. Can someone explain?
VEGAN WARRIOR (5 months ago)
Thumbs down #733...sorry we see through the masonic lies. The indoctrination has been severed :-). Thanks. P.S. I do have one question...how do they know what's at the center of the earth again? Is that theoretical or fact based on expedition or something? :-)
VEGAN WARRIOR (5 months ago)
Bullshit! LMAO Center of the earth huh? When has mankind been to the center of the earth to confirm any of this bullshit...never! Water doesn’t take shape of a ball nor does it curve. If you think it does, show me. These ideas are no different than the belief if you throw a virgin in the volcano we will have a great harvest. LMAO The stories have changed but not the lie. People nor objects can stick to a spinning ball LMAO. How ridiculous...Masonic teachings are the worst lol.
Matt Swinden (4 months ago)
.....and again you evade providing credible evidence of a flat earth.
VEGAN WARRIOR (4 months ago)
What would you say if you found out my name was on that list? Would you still BELIEVE? LOL Again, blind faith has been the plague of mankind throughout human history.
Matt Swinden (4 months ago)
VEGAN WARRIOR - Here is a link that lists the men and women that have been to space - https://en.wikipedia.org/wiki/List_of_space_travelers_by_name I see that you evade providing credible evidence of a flat earth. You claim that the photos from NASA are fake. Prove it. You have made the claim, the onus is on you to support that claim. "Again, no one experiences the earth as a globe, " That is because the earth is really huge 25,000 miles in circumference. At 69 miles, there is only 1% curvature. Just how much curve do you think you will see at ground level when you cannot see more than several miles. And yet the curve is demonstrated all time. The simplest is to watch a ship drop below the horizon, first to disappear is the waterline, then the hull, and finally the superstructure. If this was a flat earth, then the ship would never drop below the horizon, but merely stay above it but growing smaller and smaller. The same with a sunrise or sunset. If the earth were flat, then the bottom of the sun would never drop below the horizon. "The moon missions were obviously fake and space travel in no way what it is claimed to be." Prove it. You made the claim, again the onus on you to support the claim. "So if there is a burden of proof required it's on the claims of a globe" It has been proven time and time again. Most recently with over the 1 million images produced by weather satellites from various countries. "where people in Australia are literally upside down while we are literally right side up. " That is a fallacy. In space there is no upside down or right side up. Now explain why is it impossible for water to be on a "spinning ball"? Now keep in mind that the "spinning ball" is slowly rotating once per 23 hours and 56 minutes. Here is a simple experiment, place water on a slowly rotating merry-go-round that is rotating once per day. How much water is spinning off?
VEGAN WARRIOR (4 months ago)
You claim 550 people have been to space and have witnessed the shape of the earth for themselves? Are you sure? If so how, and please provide this so called evidence that has been obviously captured by all these people? You ask me to PROVE the earth is flat. My answer...proof is not required. Why? Because we only experience the earth flat. Again, no one experiences the earth as a globe, oblate spheroid nor a pear all contradictions to the fake photos shown by NASA. The moon missions were obviously fake and space travel in no way what it is claimed to be. So if there is a burden of proof required it's on the claims of a globe...where people in Australia are literally upside down while we are literally right side up. Ridiculous and this mind controlled idea requires pure imagination and blind faith. It goes against reality. Water always finds its level...impossible on a spinning ball. The burden of this lie is on you believers my friend...LOL, not me.
Matt Swinden (5 months ago)
VEGAN WARRIOR - "No one has ever or will ever experience curvature of the earth." No sir, that is an incorrect statement as over 550 men and women have gone to space and have seen and experienced the true shape of the earth. Just because YOU have not personally experienced, does not mean it does not exist. Again, I ask you, do you have any proof that is credible and scientifically sound that the earth is flat? Because your statement above has no factual validity.....it is merely your opinion and your opinion is not fact or proof. Thanks to modern day weather satellites that have taken over 1 million images of the globe earth, we have photographic proof of the true shape of the earth - like this image - https://epic.gsfc.nasa.gov/
Steve Thomas (5 months ago)
So than if were to flood on a FLAT area of ground, the water would be higher in the middle that the outsides? EG 160km of Bolivia's salt flats, would have 1000 meters in the middle and NO water on the outsides........
pre dem (5 months ago)
Contradictions after contradictions !smh
Abdullah Iqbal Ahmed (5 months ago)
Earth is not sphere? My life is a lie.
crimson knight (5 months ago)
.Geodesists .Earth Gravitational Model So in a nutshell we do not have a uniform sea-level around the world.
Cryo Scythe (5 months ago)
Disproves flat earthers. AND round-earthers.
0:33 so it must be a cube, right?
Andrew Lloyd (5 months ago)
Huh, zero info on how it is actually calculated. Tables and mountains ok. give an actual example like how Miami is calculated vs Denver.
ChArLiE BeAtZ (5 months ago)
The Earth is a pancake.
CeresTV (6 months ago)
The drawing is way too drastic. The earth isn't a perfect sphere, but it isn't a deformed meat ball either. Because of it's size it will still look like a sphere, even though measurement wise, it's not technically a sphere
Mahesh Kumar (6 months ago)
Worst explaining
Alex W. (6 months ago)
This is cool. I always figured it was atmospheric pressure!
sunte91 (6 months ago)
Answer: Prime Cain Velasquez =)
Papai Pal (6 months ago)
No mention about Hydrostatic Paradox.
bimt (6 months ago)
got me with more questions than answers...
Tasa Djukic (6 months ago)
at 3:10 it says “ ­[+m©ÙbX‹Ïs2
MachoCat (6 months ago)
You could just use air pressure. Like take the average air pressure at sea level and compare it to Mt. Everest's air pressure.
Derp Kid (6 months ago)
centrifical not centrifugal
kinhami mangila (7 months ago)
he said earth is not flat you heard that flat - earthers there is no flat earth
TerraMine (7 months ago)
“The earth isn’t flat.” You have quite a lot of people that disagree. Don’t worry; I know the earth is a sphere.
Mambodog 532 (7 months ago)
Me: Hmm... That binary means something. *Types it all into a binary-to-ASCII converter* Gets: “ ­[+m©Ùb/=Ï Me: GODAMMIT
Mike Bula (7 months ago)
sob why u speak so fast haha
Driver Spideyguyrk GT1 (7 months ago)
Those dislikes are from the people who never saw a sea.
TRUTH SEARCHING (7 months ago)
What you are explaining is theory...
John Stewart (7 months ago)
Sea Level cannot exist on a globe no matter how you calculate it. This is all a lie. The truth is that the oceans are indeed flat. Proof is here. www.itshisstory.com/globe
Random Fun (7 months ago)
"But the earth isn't flat" FLAT-EARTHERS RAGE
sivaram S (7 months ago)
Lemuria and Atlantis, lost continents in the blue shade. Could be the reason..
daniel mejia (7 months ago)
Eddie bravo said the earth is flat....
Sushil Thakre (7 months ago)
Lol not understand anything.😁
Michael (7 months ago)
0:34 if the earth is not spherical why do all the pictures of the earth show a perfect sphere? Hmm 🤔🤔
Michael (7 months ago)
Just a question, how can the sea ever be levelled at all if the earth is curved? Doesn't water fill it's container or am I missing something?...
Augustin Mance (7 months ago)
Ankit Keer (7 months ago)
So knowledgeable
Brandon Martin (7 months ago)
So, Mount Everest Isn’t Really That Many Meters Above Sea Level
Kay (8 months ago)
? What does it means when the government says a person can claim no more than 30 degrees of a land where the land extends to the foot of a mountain? Please help. How do I know where to end my claim line at the foot of the mountain?
sanjay sah (8 months ago)
Speak little slowly so that it would be​ quite easy to understand...as most of pupils don't have appropriate listening skill... thanks
Supreme Spark (8 months ago)
“But the earth isn’t flat” Whaaaaa?
Ti7 Ti7 (8 months ago)
I’m assuming we’re going with the round earth theory
quigleyfox (8 months ago)
NASA “photos” show it to be a sphere. NDT says: Oblate Spheroid. This channel claims differently. So what gives? Earth is flat by the way, water finds its level
Sammy 248 (8 months ago)
quigleyfox ok
Robert Manders (8 months ago)
Wow. I learned something today and it wasn't about how humans are destroying the planet.
Hector Nonayurbusiness (8 months ago)
Ahhh, so the earth isn't a sphere.
Michael (7 months ago)
Hector Nonayurbusiness they admitted it and no one noticed
Ren3gaid (8 months ago)
Where can I find 1:35? It's so amazing :O
airborneexplorer (8 months ago)
Bullshit! Prove it!
Rahul Ranjan (8 months ago)
Be slow man
Sameer Pagare (8 months ago)
Kya mast pakaya bc
Lino Willenbrink (8 months ago)
There ist no Zentrifugal Force!
Tony T (8 months ago)
Level. flat. plane. GO LOOK, and stop listening too PAROTS
Nicolas Dubost (8 months ago)
how do you measure the gravitational field?
FrenchCrow (8 months ago)
With a gravimeter. In ancient times like 18th century they used a pendulum (the period is related to g).
Damian TheWayne (8 months ago)
Is their volume there in this model? Because that would make the sea level rise
Dan Shetler (8 months ago)
Elevation would not have any meaning on a globe because sea level is a defined point on Earth(the surface of the ocean is considered a benchmark) that all elevations are taken from.
Jerome Mariano (9 months ago)
um, water always fills to the shape of it's container and is level
Pharaoh _C137 (9 months ago)
did I just hear that gravity is stronger on some parts of the earth than others? isn't earth's gravity 9,807m/s²? isn't it constant? what is gravitational constant then? so gravity is relative to where you are on the planet? so what does that entail ? probably dumb questions but I was just freaked by that a bit. I knew this sea level thing would be complicated after watching this video.
FrenchCrow (8 months ago)
g=9.807m/s² is the conventional standard value of gravitational acceleration on Earth. But the actual values of g is not the same all around the world because the Earth is not a perfect sphere and is not homogeneous. G=6.67408 × 10-11 m3 kg-1 s-2 is the gravitational constant, which doesn't change.
yasir gujjar (9 months ago)
Wtf man...way too complicated
John Oh (6 months ago)
Yes it is even for scientist who claim sea level rise on some bodies idea that the sea is rising. It does twice a day and one large rise once a month....
Jimmy Du (9 months ago)
amar stha (9 months ago)
The Height of EVEREST is 8848m,how did i know? Coz i am from the country where MOUNT EVEREST is 😎 anyway i enjoyed every videos ✌️
CreeperBot 793 (9 months ago)
What about tides? Sorry, I just wanted to make it more complicated
Donatas Ivaskevicius (9 months ago)
this is what lots of bollox collected together sounds like!
hyper lipidemia (9 months ago)
its pretty hard to explain that something called sea level is not level.....
jimmy jimmy (9 months ago)
The earth is flat 😠

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