A student has a short spring. He is required to investigate how the length of the spring changes as th load stretching it increases. Describe the experimental procedure he should follow, stating the equipment he should use and tge measurements he should make.

On a day when the barometer reads 75.23 cm, a reaction vessel holds 250 ml of ideal gas at 20 celsius. an oil manometer ( ρ= 810 kg/m^3) reads the pressure in the vessel to be 41 cm of oil and below atmospheric pressure. what volume will the gas occupy under s.t.p.?