Study Guides/Physics/MPa Unit in Physics
Study Guide · Physics

What is MPa (Megapascal) Unit?

MPa is a unit of pressure and mechanical stress commonly used in engineering and materials science.

Question (Click to Flip)

What is GPa?

Answer

GPa = Gigapascal = 1,000 MPa = 10⁹ Pa. It is used for extremely hard materials like diamond (which has a hardness of ~90 GPa) and the Earth's mantle pressure.

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Key Facts

The Pascal unit is named after French scientist Blaise Pascal, who made fundamental contributions to fluid pressure and hydraulics in the 17th century.

Full Form and Value

MPa = Megapascal

  • Pascal (Pa) is the SI unit of pressure = 1 Newton per square metre (N/m²)
  • Mega = 10⁶ (one million)
  • Therefore: 1 MPa = 1,000,000 Pa = 1 N/mm²

Where is MPa Used?

MPa is used wherever high pressures or mechanical stresses are involved:

  • Concrete Strength: The compressive strength of M25 grade concrete is 25 MPa.
  • Steel Tensile Strength: Mild steel has a tensile strength of ~250–400 MPa.
  • Tyre Pressure: Measured in kPa or bar, but MPa is used in research.
  • Hydraulic Systems: Heavy industrial hydraulic presses operate at 10–70 MPa.

Unit Conversions

  • 1 MPa = 10 bar
  • 1 MPa ≈ 145 PSI (pounds per square inch)
  • 1 MPa = 1 N/mm²

Questions and Answers

What is GPa?+

GPa = Gigapascal = 1,000 MPa = 10⁹ Pa. It is used for extremely hard materials like diamond (which has a hardness of ~90 GPa) and the Earth's mantle pressure.

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