18 Questions
What happens to atmospheric pressure as altitude increases?
It decreases
Why is mercury preferred as a barometric liquid in barometers?
It has a high density
What property of mercury makes it easily visible in a barometer?
It is a shiny liquid
Who was the Italian scientist credited with first measuring atmospheric pressure using a barometer?
Evangelista Torricelli
Why does the mercury level in a barometer decrease when taken up a mountain?
The air pressure is lesser
What characteristic of mercury prevents it from wetting glass in a barometer?
High density
What is the purpose of an 'aneroid barometer'?
To measure atmospheric pressure without using barometric liquid
How does an aneroid barometer work?
By balancing the internal fluid pressure with the external atmospheric pressure
What is the role of the lift pump mentioned in the text?
To lift water to a certain height without the use of electricity
How does atmospheric pressure help in drinking through a straw?
By creating low pressure inside the straw to suck up the liquid
What happens when air is expelled out of a tin can due to heating according to the text?
The can crushes under high atmospheric pressure
What purpose does a syringe or perfume spray serve according to the text?
To create low pressure for sucking up liquids
What happens to the water level in the cylinder when valve v1 is closed?
The water level stays the same
Why does water rush above the piston when the pressure in the cylinder increases?
Due to the weight of the water column in the tube
What is a limitation of using a mercury barometer?
It can easily get contaminated
Why would it be impractical to use water as a barometric liquid?
Because it requires a very large height of water
What happens when the pressure inside the cylinder decreases during the piston's upward movement?
Valve v1 opens
How does water rise from the well into the cylinder?
By opening valve v2 and closing valve v1
Learn about the measurement of atmospheric pressure using barometers and mercury columns. Understand how pressure changes with altitude and how Evangelista Torricelli first measured atmospheric pressure. Atmospheric pressure is crucial in various scientific fields.
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