7TH GRADE · PRESSURE
Hydrostatic pressure and blood vessels
Dependence of pressure on depth and equilibrium in communicating vessels.
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Basic Concepts
Hydrostatic pressure
The pressure of a fluid at rest, created by the weight of the layers located above and increasing with depth.
At the same depth in a homogeneous liquid, the pressure is the same and does not depend on the shape of the vessel.
Communicating vessels
Vessels connected below free surfaces so that liquid can flow between them.
Levels of the same liquid are set at the same height if the pressure above both surfaces is the same.
Fluid pressure measurement
The pressure gauge compares the pressure with a reference value based on the difference in levels or deformation of the sensing element.
When the sensor is immersed deeper, the reading increases, which makes it possible to experimentally test the dependence of pressure on depth.
Physical quantities
depth
The vertical distance from the free surface of the liquid to a point.
Unit: meter ·
Liquid density
The mass of a unit volume of liquid creating pressure.
Unit: kilogram per cubic meter ·
Lesson formulas
Hydrostatic pressure
The pressure of a liquid column is equal to the product of density, gravitational acceleration and depth.
Condition: Homogeneous fluid at rest; Only the pressure of its column is taken into account.
Related formulas
The same formulas in the reference, with symbols and units.
Tasks on the topic
Statements, answer options and the walkthrough.