If I have a known volume of saline/saltwater and a known specific gravity, what is the formula I use to calculate how much salt water to replace to adjust the specific gravity? Example: I have a fish tank with 50 gallons of water with a specific gravity of 1.027 and I want to reduce the SG to...

Tell me what is the specific gravity and weight density of portland cement?:)

3) An object made of iron has a mass of 5.68 g. When place in a graduated cylinder containing 20 mL of water, the water level rose to 32.8 mL. Calculate the density and specific gravity of the object.

A proton has mas 1.67x10 -27 kg and diameter 8.2 x 10 -16 m. Find specific gravity.