Rabin Kalikote

An air pump is a type of positive displacement pump specifically designed for inflating bicycle tires.

A water pump is a manually operated pump that uses human power to lift the underground water to the surface.

A water pump consists of two valves V1 and V2. Valve V1 moves up and down along with the piston and valve V2 is connected to the base of the barrel. Similarly, the barrel is connected to a pipe and the pipe is inserted into the ground. When the handle is pushed down, the piston moves upward, which creates vacuum valves between V1 and V2. In this state, V1 closes, and water enters the...

The syringe is made up of a plastic piston and barrel. The piston is fitted tightly in the barrel from the open end. The other end that is closed leaving a small tube to pass out is called a nozzle. When the piston or plunger is pulled, the vacuum is created inside the barrel and the air or liquid flows in through the nozzle. And when the piston is pushed in, the liquid or air inside flows out.

A syringe is a simple pump consisting of a plunger or piston that fits tightly in a tube that can take in and expel a liquid or gas. Its uses are as listed below:

1. Used in medical treatment.
2. Used to take out blood from the body.
3. Used to send different required drugs through the bloodstream.
4. Used in vaccination.

A barometer is a scientific instrument used to measure the atmospheric pressure of any place.

The pressure exerted by the atmosphere due to its weight is called atmospheric pressure.Its importance is:

1. Our blood pressure is balanced.
2. Helps to fill ink in the fountain pen.
3. Helps to fill medicine in a syringe.
4. Helps to fill the air in a tube.
5. Helps to drink liquid through a straw.

We all know that the density of mercury is greater than that of water. Also, densityupthrust. So, more upthrust is exerted by mercury than by water. So, an iron nail floats on mercury but sinks on water.