Free Science Videos and Lectures

Sodium is a chemical element which has the symbol Na (Latin: natrium), atomic number 11, atomic mass 22.9898 g/mol, oxidation number +1.

Sodium is a soft, silvery white, highly reactive element...

This science video contains:
explosion, water, burning, reaction, fire, alkali, sodium, na

This video shows action much slower than you see on television or with your eyes.

For example, a puma running ten times slower, you can see every muscle moving. Then some bird flying 10 times...

This science video contains:
high resolution, balloon, bird, explosion, slow motion, high fps, puma, camera, incredible details

Since sodium reacts slower than other alkali metals, the reaction is so intense. It just burns for a while.

This video was done by University of Oxford.

This science video contains:
burning, chlorine, reaction, fire, alkali, sodium

Sagan was central to the discovery of the high surface temperatures of the planet Venus.

In the early 1960s, no one knew for certain the basic conditions of Venus' surface and Sagan listed the...

This science video contains:
venus, carl sagan, planet, nasa, 1960

On one of the Moon missions, NASA astronauts decided to prove Galileo Galilei right.

He reasoned that if there was no atmosphere, no dragging force then two objects of different mass falling from...

This science video contains:
ground, force, nasa, moon, galileo galilei, astronaut, atmosphere, gravity, hammer, feather