The process by which fat became solid at room temperature is called?

Fats are made up of long chains of carbon with hydogen Adams attached to the sides. The more hydrogen there is the straighter the molecules are and the more molecules that will fit in a given area and therefore making the fat more dense and solid. This is where the term "Saturated Fat" comes from because the molecule is "Staturated" with hydrogen. Unsaturated fats have less hydrogen which makes the molecule bend and curl so that they don't fit close together and that makes the fat less dense and stay liquid at lower temperatures.