This compound was made by the chemical combination of two different elements.

These two elements chemically combine to create a new substance.

This crystal has a very beautiful shape.

His thoughts finally crystallized.

He has the ability to change into a wolf.

There is a large cooling tower in this factory.

A cooling device utilizing the principle of radiative cooling has been developed.

The phenomenon of supercooling is very interesting in the world of science.

His travel story was very interesting.

Physics is a difficult subject.