Fluid pressure, upthrust and atmospheric pressure

What is fluid pressure?

Fluid pressure is the force per unit area exerted by a fluid (liquid or gas) on an object immersed in it.

What is atmospheric pressure?

Atmospheric pressure is the pressure exerted by the air in the Earth's atmosphere, which decreases with altitude.

How is fluid pressure calculated?

Fluid pressure is calculated using the formula: Pressure = Force / Area (P = F / A).

What causes atmospheric pressure?

Atmospheric pressure is caused by the weight of the air molecules pushing down on objects.

How does the depth of a fluid affect the pressure?

Fluid pressure increases with depth due to the increasing weight of the fluid above.

What is upthrust (or buoyant force)?

Upthrust is the upward force exerted by a fluid on an object submerged in it, which opposes the weight of the object.

What is Archimedes’ principle?

Archimedes’ principle states that the upthrust on an object submerged in a fluid is equal to the weight of the fluid displaced by the object.

How do you calculate the upthrust on an object?

Upthrust = Weight of the displaced fluid.

Why does a helium balloon rise in the atmosphere?

A helium balloon rises because the upthrust (buoyant force) acting on it is greater than its weight.

How does the density of a fluid affect the upthrust?

The denser the fluid, the greater the upthrust on an object submerged in it.

What happens when the weight of an object is equal to the upthrust?

The object will float or remain stationary in the fluid.

What is the relationship between atmospheric pressure and altitude?

As altitude increases, atmospheric pressure decreases because the weight of the air above decreases.

How does fluid pressure affect submerged objects?

Fluid pressure increases with depth, which can exert forces on submerged objects.

How can you reduce fluid pressure?

Fluid pressure can be reduced by decreasing the density or depth of the fluid.

Why does a ship float on water?

A ship floats because the upthrust from the water is equal to the weight of the ship, as per Archimedes' principle.