Year 11 Exam > Year 11 Notes > Physics for GCSE/IGCSE > Pressure in a Liquid
Pressure in a Liquid | Physics for GCSE/IGCSE - Year 11 PDF Download
Pressure in Liquids
- A fluid can be classified as either a liquid or a gas.
When an object is submerged in a fluid, the fluid applies pressure, compressing the object.
- This pressure is uniformly distributed across the entire fluid surface and extends in all directions.
- The pressure exerted on objects within fluids generates forces against surfaces.
- These forces operate perpendicular to the surface, at a 90-degree angle.
- The pressure exerted by a fluid on an object escalates with:
- Greater depth within the fluid.
- Enhanced density of the fluid.
Calculating Pressure in Liquids
- When determining the pressure in liquids, it is crucial to consider the difference in pressure at various depths within the liquid.
- This pressure can be calculated using the formula:
Δp = ρgΔh - Where:
- Δp represents the change in pressure in pascals (Pa), where 1 Pa equals 1 N/m2.
- ρ stands for the density of the liquid in kilograms per cubic meter (kg/m3).
- g denotes the gravitational field strength on Earth in newtons per kilogram (N/kg).
- Δh indicates the change in height of the liquid column in meters (m).
- The pressure force on objects in a liquid is uniformly spread over the entire surface.
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Apr 26, 2025
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