(a) A car tyre (i.e. an automobile tire) was inflated to a pressure of 24 lb in⁻² (1.00 atm = 14.7 lb in⁻²) on a winter’s day when the temperature was –5°C. What pressure will be found, assuming no leaks have occurred and that the volume is constant, on a subsequent summer’s day when the temperature is 35°C? What complications should be taken into account in practice?

(b) A sample of hydrogen gas was found to have a pressure of 125 kPa when the temperature was 23°C. What can its pressure be expected to be when the temperature is 11°C?