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List any four units of pressure.

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Here are four units of pressure:

1. **Pascal (Pa)**: The SI unit of pressure, defined as one newton per square meter.
   
2. **Bar**: A metric unit of pressure equal to 100,000 pascals. It's commonly used in meteorology and engineering.
   
3. **Atmosphere (atm)**: A unit based on the average atmospheric pressure at sea level, equal to 101,325 pascals.
   
4. **Millimeter of Mercury (mmHg)**: A unit originally defined by the height of a mercury column in a barometer. It's commonly used in medicine and meteorology.
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Certainly! Here are four common units of pressure:

1. **Pascal (Pa)**: The SI unit of pressure, where 1 Pascal is equal to 1 Newton per square meter (N/m²).

2. **Bar**: A metric unit of pressure where 1 bar is equal to 100,000 Pascals or 100 kilopascals (kPa).

3. **Atmosphere (atm)**: A unit based on atmospheric pressure at sea level, where 1 atmosphere is approximately equal to 101,325 Pascals.

4. **Pound per Square Inch (psi)**: A unit of pressure used in the imperial system, where 1 psi is approximately equal to 6894.76 Pascals.

These units are commonly used in various fields such as engineering, meteorology, and everyday applications.
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