What are concave and convex mirrors?

What is the conversion factor between kg/m^3 and g/m^3. express your experimental values for the densities in kg/m^3.

What are the theoretical properties of a gas at a temperature of 0 kelvin?

Oxygen undergoes an isentropic expansion from 120 degree c and 280 kpa absolute to 140 kpa absolute. determine the final temperature of the oxygen and the amount of work per kg of o_2 produced in the process if it is adiabatic.