U9.3 – Ideal Gases

What is an ideal gas?

For a fixed mass of gas, which graph shown best represents Charles's Law?

For a fixed mass of gas, which graph shown best represents Boyle's Law?

For a fixed mass of gas, which graph shown best represents The Pressure Law?

The best vacuum that a physics teacher dreams of obtaining in their classroom is laboratory standard. This is about 1 x 10^-13 Pa. How many molecules per m³ at 25 °C?

A storage tank can store 30 L of compressed helium and a pressure of 30 atm at 20 °C. The tank is current 56% full. How many 12 cm radius balloons filled to 1.2 atm will the tank fill? 1 atm = 101.325 kPa. Assume the balloons are perfectly spherical

You lock up your bike in the school racks before registration and your bicycle tyres are fully inflated and leak free, with an absolute pressure of 7.00 × 10⁵ Pa each at 14 °C. You go back at lunchtime, and notice the sun has been shining on your front tyre all morning and the temperature is now 27 °C. What is the pressure in the front tyre?

You're at Cleethorpes for your birthday and your friends have bought you a large helium-filled balloon, which you accidently let go of in the excitement of it all. What is the pressure inside your balloon if it starts out at sea level (1 atm) at a British summer seaside temperature of 10 ºC and rises to an altitude where its volume is twenty times the original volume and its temperature is –50 °C? 1 atm = 101.325 kPa.

On average, the lungs of an average person holds 2 L of air. Calculate the number of molecules in the lungs, assuming the temperature is 37 °C and the pressure 101.325 kPa.

A fire extinguisher works by pressurised air forcing the water out. A water fire extinguisher contains 4 L of air at 1345 kPa at 23 °C. When discharged, the volume of air increases to 7.5 L and the temperature decreases to 2.5 °C. Calculate final pressure.