fluid pressure

• fluids are substances that can flow because their particles are able to move around
• as particles in fluids move around, they collide with surounding particles and transfer energy
• pressure is a force per unit area, so this means that particles exert a pressure
• you can calculate the pressure at the surface of a fluid by using:

  $p =$$\frac {F}{A}$
• the more dense a given liquid is, the more particles it has in a certain space. this means there are more particles that are able to collide so the pressure is higher
• as the depth of a liquid increases, the number of particles above that point increases. the weight of these particles adds to the pressure felt at that point, so the liquid pressure increases with depth
• you can calculate the pressure at a certain depth due to the column of liquid above using:

  $p =$$h\rho g$