The water tank is 8 m above the tap. What pressure forces the water out from the tap?

To determine the pressure that forces the water out from the tap, we need to understand the concept of pressure and how it relates to the height difference between the water tank and the tap.

Pressure is defined as force per unit area, and it is typically measured in units such as pascals (Pa) or pounds per square inch (psi). In the context of fluid pressure, the force is applied by the weight of the fluid.

In this case, the water tank is situated 8 meters above the tap. The pressure at the tap is created by the weight of the water column above it. This pressure is known as hydrostatic pressure and can be calculated using the formula:

P = ρ * g * h

Where:
P is the pressure (in pascals or Pa)
ρ is the density of the fluid (in kilograms per cubic meter or kg/m³)
g is the acceleration due to gravity (approximately 9.8 m/s²)
h is the height difference (in meters)

The density of water is approximately 1000 kg/m³.

Using the given information, we can substitute the values into the formula:

P = 1000 kg/m³ * 9.8 m/s² * 8 m

P = 78,400 Pa

Therefore, the pressure that forces the water out from the tap is 78,400 pascals (Pa).