engineering

Pressure

Force applied per unit area, measured in pascals (Pa), psi, atm, or bar.

Pressure = Force / Area. It describes how concentrated a force is over a surface.

Common Units

  • 1 atm = 101,325 Pa = 14.696 psi = 1.01325 bar
  • 1 bar = 100,000 Pa β‰ˆ 14.504 psi
  • mmHg: 1 atm = 760 mmHg (used in medicine)

Types

  • Atmospheric: Weight of air above a surface (14.7 psi at sea level)
  • Gauge: Pressure above atmospheric (tire pressure)
  • Absolute: Gauge + atmospheric (used in thermodynamics)
  • Hydrostatic: P = ρgh (pressure from fluid depth)

Related Calculators

πŸ“Š Pressure Vessel CalculatorπŸ“Š Ideal Gas Law Calculator

Related Terms

Ohm's Law

The relationship between voltage, current, and resistance in an electrical circuit: V = I Γ— R.

Kilowatt-Hour (kWh)

A unit of energy equal to using 1,000 watts of power for one hour.

Torque

A rotational force that causes an object to rotate around an axis, measured in newton-meters or foot-pounds.

BTU (British Thermal Unit)

A unit of heat energy equal to the amount needed to raise one pound of water by one degree Fahrenheit.

Thermal Conductivity

A material property that measures how well it conducts heat, expressed in watts per meter-kelvin (W/mΒ·K).

Specific Heat Capacity

The amount of heat energy required to raise the temperature of one unit mass of a substance by one degree.