Question

In the celebrated equation e = mc2, the c2 is the _________.

Answer 1

Hello!

In the celebrated equation e = mc2, the c2 is the proportionality constant of energy and mass.

This famous equation was proposed by Albert Einstein in 1905, and implies that when there is a certain mass, there is a certain amount of Energy associated with it even is the mass is in a steady state. The proportionality constant c² is the speed of light squared. 

Have a nice day!