Maharashtra BoardEnglish MediumSTD 8ScienceForce and pressure.5 Marks
Question
Define pressure. What is the relation between pressure, force and area? State the units in which pressure is measured.
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Answer
Pressure is defined as a measure of the force applied over a unit area. Pressure often is expressed in units of Pascals (Pa), newtons per square meter ( $N / m ^2$ or $kg / m . s ^2$ ), or pounds per square inch. Other units include the atmosphere (atm), torr, bar, and meters sea water (msw).
In equations, pressure is denoted by the capital letter P or the lowercase letter p.
Pressure is a derived unit, generally expressed according to the units of the equation:
$\text{P}= \frac{\text{F}}{\text{A}}$
Where P is pressure,F is force, and A is area.
P is pressure.
F is the component of force perpendicular to the surface.
A is the area of the surface.
When a force is constant over an area, the pressure acting on that area is simply.
Pressure is a scalar quantity, thus it acts in all directions at any given point. In order for pressure to create a force, the pressure must be integrated over some area.
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