![Quote](images/metro/blue/misc/quote_icon.png)
Originally Posted by
igibouy
If we are just floating in space without any influence in gravity then, like I said, we often can't calculate the mass. But, if we are floating in space orbiting something like, say, the sun, then you can use Kepler's third law to calculate our mass in space (T^2 /r^3 = 4Pi^2 /GM). This method is only one of the ways to calculate for mass. You can also use M = 4 π^2 a^3 / (G T^2 ) where n = pi, T = revolution time, G = universal gravitational constant (6.67384 × 10^-11 m3 kg^-1 s^-2)
In common terms, mass and weight can be interchangeable so it is understandable why there is confusion. In science and engineering, Mass isn't your weight, per se, but the 'amount' of matter in your body. Weight is the effect of gravity on you. You weigh less on the moon because of lower gravity but the amount of stuff in you remains the same.
So you mean something like m=V(amu)? When you say the amount of matter, are you referring to getting the total mass of each particle in an object?