How do I calculate the weight of a material knowing its density?

Answer 1

There is a simple trick you can use to remember. Imagine a triangle. Place a D in the lower left corner, an M in the top corner, and a V in the lower right corner. Now look at what you have.
..M
D V

Density = Mass / Volume
Mass = Density x Volume
Volume = Mass / Density

(Jot this down on your tests and you'll never forget how to convert! An easy way to remember the order is the letters DMV stand for Department of Motor Vehicles, so left to right you have DMV!)

Finally,
Weight = Mass x Acceleration (gravity, which is 9.8 meters/sec)

Answer 2

Density= Mass/Volume

Answer 3

Depending of the shape of your material and first calculating it's volume you can calculate the weight like this:
density (Kg/m*3)= mass(Kg)/volume(m*3)- knowing the volume you can now obtain the mass, then the
weight (Newton)= mass(Kg) * gravity accelaration (9.8 m/s)

Answer 4

Start with a known Volume of water, place the object in the water, get the new volume and subtract the first volume then plug in values into the equation d/v=m

Answer 5

Mass = volume * Density
Weight = mass * acceleration due to gravity