Question

In order to make bose Einstein condensate, a gas of very low density is cooled down at a very low temperature, but when it is cooled down, gas starts becoming more denser. Explain why is recommended to cool a gas of very low density

Answer 1

When we cool a gas, we actually compress it.

It is easier to compress a less dense object. This is applicable everywhere.

For eg., a sponge is less desne than iron or wood, so you can easily compress a sponge but not iron.

Also, as you compress, it becomes difficult to compress it further as its density is already high.

So a gas with low-density is used to make Bose-Einstein Condensate.