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Zorluk: KolayHeat Engines and Refrigeration Principles

In a reciprocating heat engine, such as a basic steam engine, high-pressure hot gas is used to push against a piston to perform mechanical work. What happens to the volume and the temperature of the gas as it pushes the piston outward?

  1. The gas expands in volume, and its temperature decreases as thermal energy is converted into work.Cevap
  2. B
    The gas volume remains constant because fluids used to transfer physical force cannot be expanded or compressed.
  3. C
    The gas contracts in volume because exposing a material to high heat causes it to physically shrink.
  4. D
    The gas expands in volume, but its temperature remains perfectly constant like a material undergoing a phase change.

Cevap

The gas expands in volume, and its temperature decreases as thermal energy is converted into work.
In any basic heat engine, the working fluid (a hot, high-pressure gas) generates power by expanding. As it pushes the piston outward (increasing its volume), it expends its own internal thermal energy to do that mechanical work, which inherently causes its temperature to drop.

Adım Adım Çözüm

1
Analyze the mechanical action taking place in the cylinder.
The hot gas pushes the piston outward to create movement.
This is how heat engines generate mechanical work.
2
Determine the change in volume.
The volume of the gas increases.
As the piston is pushed outward, the physical space inside the cylinder becomes larger, allowing the gas to expand.
3
Determine the change in temperature based on thermodynamic principles.
The temperature of the gas decreases.
Energy cannot be created or destroyed. The thermal energy of the hot gas is converted into the mechanical work of moving the piston, meaning the gas must lose heat and cool down.

Anahtar Kavram

Heat engines operate by converting the internal thermal energy of a high-pressure gas into mechanical work through expansion, which naturally causes the gas to cool.
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Heat Engines and Refrigeration Principles

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