How do you find weight when you have density and volume?

Answer 1

When density and volume are given, the formula for density can be used to determine the mass of the object.

density = mass / volume

mass = density * volume

Assuming the object is on Earth, it can be assumed that g=9.80 N/kg.

w= mg, or

weight = mass * gravitational constant (of Earth)

purely algebraically,

weight = density * volume * gravitational constant.

Answer 2

Density, normally represented with the Greek letter "rho", ρ, is defined as mass divided by volume:

ρ = m/V

So given the density and mass, the volume would be:
V = m/ρ

Answer 3

density = mass x volume

rearranging we get mass = density/volume