Question

Why is compass needle kept in a closed glass vessel

Answer 1

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...

Answer 2

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.