William Heathcote Solutions for Chapter: Environment, Exercise 7: Exercise 7

The density of air is about $1.2 kg/m^3$.Estimate the mass of air in the room that you are in.

Iron has a density of $7870 kg/m^3$. Calculate the volume of iron which would have the mass value $150kg$.

The kilogram is defined by a cylinder of a platinum-iridium alloy called the international prototype kilogram kept in pairs. The cylinder has a density of $21,189 kg/m^3$ and a height of $39.17 mm$. Calculate the cross-sectional area of the cylinder.

The kilogram is defined by a cylinder of a platinum-iridium alloy called the international prototype kilogram kept in pairs. The cylinder has a density of $21,189 kg/m^3$ And a height of $39.17 mm$. Calculate the diameter of the cylinder.