By which name is the pressure gas machine known?

Options

A. Barometer
B. Thermome
C. Seismograph
D. Hygromete

Explanation

To answer the question "By which name is the pressure gas machine known?", follow these steps:

1. **Identify the Purpose of the Machine**: The question asks for the name of a machine that measures gas pressure.

2. **Consider the Options**: The options provided in the video transcript include:
- Barometer
- Thermometer
- Seismograph
- Hygrometer

3. **Evaluate Each Option**:
- **Barometer**: This device is specifically designed to measure atmospheric pressure, which relates to gas pressure.
- **Thermometer**: This device measures temperature, not pressure.
- **Seismograph**: This device measures seismic activity, specifically earthquakes, and is not related to gas pressure.
- **Hygrometer**: This device measures humidity, which is also not related to gas pressure.

4. **Select the Correct Answer**: Based on the evaluation, the barometer is the only device that measures pressure, making it the correct answer.

5. **Final Answer**: The pressure gas machine is known as a **barometer**.