1. What is Pressure Conversion?

Pressure conversion is the process of changing pressure measurements from one unit to another. Atmospheric pressure can be measured in various units including atmospheres (atm), millimeters of mercury (mmHg), kilopascals (kPa), pounds per square inch (psi), and bars (bar).

2. How Does the Calculator Work?

The calculator uses standard conversion factors:

Where:

• All conversions are done via standard atmosphere (atm) as the intermediate unit
• 1 atm = 760 mmHg = 101.325 kPa = 14.6959 psi = 1.01325 bar

3. Common Pressure Units

Atmosphere (atm): Standard atmospheric pressure at sea level
mmHg: Millimeters of mercury, commonly used in medicine
kPa: Kilopascals, SI unit of pressure
psi: Pounds per square inch, common in engineering
bar: Metric unit of pressure, commonly used in meteorology

4. Using the Calculator

Tips: Enter the pressure value, select the original unit, then select the target unit. The calculator will provide the converted value with high precision.

5. Frequently Asked Questions (FAQ)

Q1: Why are there different pressure units?
A: Different fields (meteorology, medicine, engineering) developed their own standard units based on their measurement needs.

Q2: What's the most accurate pressure unit?
A: All units are equally accurate when properly converted. The SI unit (Pascal) is preferred for scientific work.

Q3: How does altitude affect pressure?
A: Atmospheric pressure decreases with altitude - about 1 mmHg per 27 ft elevation gain.

Q4: What is standard atmospheric pressure?
A: Defined as 1 atm, 760 mmHg, 101.325 kPa, 14.6959 psi, or 1.01325 bar at sea level at 15°C.

Q5: Can I convert between metric and imperial pressure units?
A: Yes, the calculator handles conversions between all common metric and imperial pressure units.