Answer :
When heat is supplied to a gas enclosed in a fixed piston container, several things can happen depending on the specific conditions. Here are the two most common scenarios:
**Scenario 1: The piston can move freely (isodynamic process)**
* In this scenario, the piston can move to accommodate the expanding gas. As heat is added, the gas molecules move faster and collide with the container walls more frequently and with greater force. This increased pressure pushes the piston outward, increasing the volume of the container.
* Since the volume increases while the pressure remains constant (isodynamic), the internal energy of the gas increases proportionally to the heat supplied (遵循 / zūn xún - follow) according to the First Law of Thermodynamics.
* There is no net work done on the surroundings because the piston moves but the pressure remains constant.
**Scenario 2: The piston is fixed (isochoric process)**
* In this scenario, the piston is fixed in place, preventing the container's volume from changing. As heat is added, the gas molecules still move faster due to the increased thermal energy. However, since the volume is constant, the pressure inside the container increases significantly.
* In this case, the entire heat supplied goes towards increasing the internal energy of the gas (isochoric process). There is no external work done because the volume doesn't change.
**Important points to remember:**
* The specific outcome (isodynamic or isochoric) depends on the design of the container. A fixed piston container represents an isochoric process, while a container with a freely moving piston represents an isodynamic process.
* In both scenarios, the internal energy of the gas increases due to the heat supplied.
For a more detailed analysis, additional information like the type of gas, the amount of heat supplied, and the initial conditions (pressure and temperature) would be required.