What is linear thermal expansion?
Linear thermal expansion is the same concept, but the expansion makes the item longer- if we want to measure linear expansion, we measure the length by which something has expanded (or retracted) due to gaining (or losing) heat.
For example, lets think about a thin metal rod that has gained a certain amount of energy. It will expand linearly, meaning that the rod will become slightly longer. To calculate the change in the length, we use this equation:
Note that this equation gives the change in linear expansion and not the new length. If the object was expanding, then we add the