Change of a liquid to a solid is called what

The lab procedure involves several factors, listed below some were variable and some were constant. label each factor below v for variable ot c for constant

Which of the following statements is true? a. most heat energy is easily recovered and used for useful actions. b. friction causes molecules to vibrate more slowly. burning air and gasoline in an c. engine changes chemical energy into mechanical energy. it is impossible to d. change mechanical energy into mechanical energy.

Aconversion factor is a ratio of equivalent values used to express the same units in different quantities