Get smart curated videos delivered to your inbox every week.      
The Kid Should See This

What is Sea Level? – Minute Physics

Sea Level! What is it and how do scientists calculate it? As it turns out, there are actually many complexities in determining this measurement. For example, Earth isn’t actually a sphere, gravity is stronger and weaker at different points around the globe, and of course, there are a lot of mountains that are no where near water — so how do we know what sea level would be? In this video, Minute Physics explains the details.

After you’ve watched, check out these related links: ellipsoid, geoidgeodesists, Mount Everest, Chimborazo Volcano,’s Best Gravity Map Yet Shows a Lumpy, Bumpy Earth, and this clarifying and not-to-be-missed animated gif of Earth’s gravity field.

In the archives: videos about or involving measuring things, including Measuring the Universe.

tksst gift guide

🌈 Watch these videos next...

How An Airplane Is Made – MinutePhysics

Rion Nakaya

Why are your fingerprints unique?

Rion Nakaya

This Is Not A Bee

Rion Nakaya

Why The Full Moon is Better in Winter – Minute Physics

Rion Nakaya

Why Earth Has Two Levels

Rion Nakaya

Why Do Rivers Curve? – MinuteEarth

Rion Nakaya

Get 7 smart videos delivered every week.