Describe the working principle of an aneroid barometer
Answers
★ Principle:
A metal box partially exhausted of air (vaccum) will undergo changes of shape as the outside pressure varies. These small movements of the box are transmitted to a pointer displayed on the face of the aneroid barometer by a system of levers.
★ Construction & Working:
Its construction includes a thin metal chamber which is sealed but having partial vacuum inside. This chamber is fitted with certain levers and spring mechanism to which a needle is connected, which shows the barometer readings in milibars or hectopascals projected on a graduated circular card. The thin metal chamber has elastic properties, when atmospheric pressure increases this chamber gets compressed when atmospheric pressure decreases the chamber gets expanded, this inward and out ward movement of the chamber acts on the needle mechanically and the needle then registers reading a on the graduated card. The accuracy of the reading depends upon the s the metal chamber, if the chu is large, accuracy will be better.
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Explanation:
inside a aneriod barometer is a small capsule this capsule has had the air pumped out of it when air pressure risess the sides of a capsule is compressed that capsule is attched to levers which move the neddle as the air pessure squeezes the capsule