Free Science Videos and Lectures

Sodium does not react easily with oxygen at a room temperature so it has to be heated up a little for the reaction to start.

Since air is mostly oxygen once the reaction starts it gets pretty...

This science video contains:
explosion, heat, burning, reaction, fire, air, oxygen, sodium

When potassium is heated is starts reacting with oxygen. Since air is mostly oxygen, the reaction happens pretty quickly and it starts burning.

This science video contains:
heat, burning, reaction, fire, air, oxygen, potassium

A new type of automatic door is presented at japan tech fair.

The idea is that the door is made out of many pieces where has a motion detecor and as you approach them they open just the parts of...

This science video contains:
japan, door, motion detectors, box, heat, new idea