# What does e equal?

e, or Euler's number, is roughly equal to 2.718. For more information, see the related link.

e is also used to refer to other properties. In the following famous equation, e refers to energy:

enegy= mass x the speed of light squared which for short is e=mc2

E in the equation "E = mc^2" refers to "Energy".

m refers to mass.

c is the speed of light.

### Why does lne equal 1?

e = 2.71828183 (approximately) The definition of ln is this: ln x = y when e ^ y = x. It's an inverse property... So ln x means "find out what value y would need to have so that e ^ y equals x" Since e ^ 1 = e, ln e has to equal 1. because in line equation to signify that the task/job is done. This is why it is equal to 1…