Question
Download Solution PDFWhat is the dimension of pressure?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFOption 2 is correct, i.e. M1L-1T-2
- Pressure:
- It is the component of the force normal to the area under consideration.
- Its dimensions are M1L–1T–2.
- The pressure is a scalar quantity.
- The SI unit of pressure is Nm–2. It has been named as pascal (Pa).
- Pressure (P)=(Force (F))/(Area (A)).
i.e., \(P=\frac{F}{A}\)
- Atmospheric Pressure:
- The pressure of the atmosphere at any point is equal to the weight of a column of air of unit cross-sectional area extending from that point to the top of the atmosphere.
- At sea level, it is 1.013 × 105 Pa (1 atm).
- Atmospheric pressure is measured by the help of a Barometer.
- Gauge Pressure:
- The pressure, at depth below the surface of a liquid open to the atmosphere, is greater than atmospheric pressure by an amount ρgh. The excess of pressure, at depth, is called gauge pressure.
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