m = mass.
M represents Mass
energy
m can either represent mass or moles, depending on the context.
P= M/No
m = mass.
M represents Mass
energy
Lower case m usually represents the mass of the object which is the subject of the formula.
It represent the chemical formula.
m can either represent mass or moles, depending on the context.
The speed of light, in a vacuum.
C equals the speed of light in a vacuum (light travelling no substance what so ever). Which is about 299 792 458 m / s. Because of this formula C=√(E/m)
ionic
The formula for D m v would be D=M/V. This is the formula for density.
It is a formula, e, m and c can represent an infinite amount of numbers, and are meant to be substitued by the number, as you need to know at least 2 of them to figure out the entire formula.
This would be the standard formula for calculating momentum. P represents momentum which is calculated by mass * velocity.