Air is pumped into a bicycle tyre at constant temperature:
Correct answer: A. More molecules strike the tyre wall per second
- A. More molecules strike the tyre wall per second
- B. The molecules are larger
- C. The molecules are farther apart
- D. Each molecule come close to other
Explanation
When air is pumped into a bicycle tire at a constant temperature, the process is considered an isothermal process. In an isothermal process, the temperature remains constant, which means the average kinetic energy of the gas molecules also remains constant. As more air is pumped into the tire, the volume of the gas increases. According to the ideal gas law (PV=nRT), at constant temperature, an increase in volume leads to a decrease in pressure. To maintain the pressure inside the tire, more air molecules need to strike the tire wall per unit of time.
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About Thermal Equilibrium and Heat
Thermal equilibrium means that bodies in contact have the same temperature and no net heat flows between them. The topic distinguishes heat from temperature, uses the zeroth law of thermodynamics, and covers heat transfer, specific heat capacity, thermal expansion and the conditions for reaching equilibrium.
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