Physics: Pressure and Units

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Questions and Answers

What is the equivalent of 1 bar in units of Pa?

  • 1020 Pa
  • 105 Pa (correct)
  • 100 Pa
  • 10 Pa

What is the absolute pressure measured relative to in all calculations of state?

  • Absolute zero pressure (correct)
  • Gauge pressure
  • Atmospheric pressure
  • Relative pressure

What is the equivalent of 1 atm in units of bar?

  • 0.101325 bar
  • 10.1325 bar
  • 0.013325 bar
  • 1.01325 bar (correct)

What is the unit of pressure that is equal to 760 mmHg?

<p>1 atm (B)</p> Signup and view all the answers

What is the equivalent of 1 MPa in units of kPa?

<p>1000 kPa (C)</p> Signup and view all the answers

What type of pressure measurement is often used in real-world applications?

<p>Gauge pressure (B)</p> Signup and view all the answers

What is the term for pressure measured relative to atmospheric pressure?

<p>Gauge pressure (C)</p> Signup and view all the answers

What is the reference point for gauge pressure measurement?

<p>Atmospheric pressure (A)</p> Signup and view all the answers

What type of pressure is measured with respect to a complete vacuum?

<p>Absolute pressure (B)</p> Signup and view all the answers

What is the term for pressure measured with respect to the surrounding environment?

<p>Gauge pressure (C)</p> Signup and view all the answers

What is the unit of pressure in the SI system?

<p>N/m2 (D)</p> Signup and view all the answers

What is the unit of pressure in the English system?

<p>lbf/in2 absolute (A)</p> Signup and view all the answers

What is the force per unit area called?

<p>Pressure (D)</p> Signup and view all the answers

What is the equivalent of Pascal in the SI system?

<p>N/m2 (D)</p> Signup and view all the answers

What is the unit of pressure that is not mentioned in the passage?

<p>bar (D)</p> Signup and view all the answers

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Study Notes

Units of Pressure

  • 1 bar is equivalent to 105 Pa, 102 kPa, and 0.1 MPa
  • 1 atm (atmospheric pressure) is equivalent to 1.01325 bar, 14.696 psia, and 760 mmHg

Pressure Measurement

  • Pressure is measured relative to absolute zero pressure in all calculations of state
  • Pressure can be measured relative to atmospheric pressure, which is called gauge or vacuum pressure

Definition of Pressure

  • Pressure is defined as force per unit area
  • The unit of pressure is the Pascal (Pa) in the SI system, which is equivalent to N/m2
  • In the English system, the unit of pressure is psia (pound-force per square inch absolute) or lbf/in2

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