This question is about pressure.
Explain why a drawing pin (thumbtack) has a large flat head at one end and a very sharp point at the other, making it easy to push into a wooden board.
Small gas canisters containing pressurized carbon dioxide are used to inflate bicycle tires.
Using ideas about particles, explain why the pressure in the canister decreases as the carbon dioxide is released to inflate the tires.
A canister supplies 12 000 cm312\,000\text{ cm}^312000 cm3 of carbon dioxide at a pressure of 1500 kPa1500\text{ kPa}1500 kPa. The volume of each bicycle tire is 3100 cm33100\text{ cm}^33100 cm3. The pressure exerted by the gas in each tire is 300 kPa300\text{ kPa}300 kPa. Calculate how many tires can be fully inflated using the carbon dioxide from the canister. [Assume the temperature of the carbon dioxide remains constant]