Question

1. list the various units used to measure pressure, and identify the si unit.

Explanation:

Pressure is the force applied per unit area. Various units to measure pressure include:

1. Pascal (Pa): The SI unit of pressure, defined as \(1\ \text{Pa} = 1\ \text{N/m}^2\) (where \( \text{N} \) is newton, the unit of force, and \( \text{m}^2 \) is square meter, the unit of area).
2. Atmosphere (atm): A unit based on the average atmospheric pressure at sea level. \(1\ \text{atm} \approx 101325\ \text{Pa}\).
3. Millimeter of Mercury (mmHg): Often used in measuring blood pressure and gas pressures. \(1\ \text{mmHg} \approx 133.322\ \text{Pa}\), and \(760\ \text{mmHg} = 1\ \text{atm}\).
4. Bar: A non - SI unit but commonly used in industry. \(1\ \text{bar} = 10^5\ \text{Pa}\).
5. Pound - force per square inch (psi): Used mainly in the United States, especially in engineering and for tire pressure. \(1\ \text{psi} \approx 6894.76\ \text{Pa}\).

The SI unit of pressure is the Pascal (Pa).

Answer:

Units of Pressure:

• Pascal (Pa)
• Atmosphere (atm)
• Millimeter of Mercury (mmHg)
• Bar
• Pound - force per square inch (psi)

SI Unit of Pressure:

Pascal (Pa)