Question

describe working mechanism of hand pump

Answer 1

Simply defined, hand pumps are manually operated pumps that use human power and mechanical advantage to move fluids or air from one place to another. The water pumpis operated under the principle of pressure theory. There are two plungers, one is top side and other is bottom side and which is sealed by valve

Answer 2

It was designed in 1970 through the joint efforts of the government of India, UNICEF and WHO. Its purpose was to address the deathly problem of paucity of water and draught in rural areas of developing nations. By the mid 1990s, five million of the pumps had been manufactured and installed around the world.
To read more about how hand pumps revolutionalised rural lifeSimply defined.Hand pumps are manually operated pumps that use human power and mechanical advantage to move fluids or air from one place to another.