Why is compass needle kept in a closed glass vessel
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To not only keep it clean and dust-free so it spins freely, but to prevent it from being influenced by the immediate conditions around it, such as moisture and air movement...
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Answer:
compass is a small thin magnet.It is used for navigation purposes.It is important to keep in a closed glass vessel because if it is left open it may deflect due to the pressure of the air.
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