Fourth year of secondary education
Pressure (I)
E. Vallo - J.Villasuso
 Pressure
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Introduction and objectives
This topic is going to define the concept of pressure and hydrostatic pressure and we will study how it acts and how it varies in liquids at rest. We will also study some practical applications.
 


Gases and liquids are fluids, which can be moving or at rest (static), but remember that although the mass may be at rest, its particles, atoms and molecules are continually agitated.

Hydrostatics studies liquids at rest.

The pressure in a liquid increases with its depth.

A submerged object in a liquid at rest experiences, on each of its faces, a  force caused by pressure which increases with the depth and acts perpendicularly to each face, whatever the direction it is pointing in.

The forces which are caused by pressure on the faces of a submerged body, when the liquid is at rest,  have to be perpendicular to the surface as, if they weren't, the horizontal component of the force would move the liquid parallel to the faces.

Objectives of the topic (click on next at the top right hand corner of the page).

 

What is pressure? How does it work?
Units
Hydrostatic pressure
Mathematical expression
The pressure increases the deeper you go in liquids
Which goes the furthest?
A little goes a long way!
Communicating vessels
Syphons
Pascal's Law
The Law
The hydraulic press
Hydraulic brakes: drum brakes
Manometers
Problems
Evaluation

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