What is the smallest possible piece an element in broken down into my normal laboratory processes

What is a possible result of higher air temperature caused by global warming

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.?

Ascientific blank must be testable and capable of being proven false?