To empty an oil tin, two holes are made diagonally. Why?
When hole A is made in the tin, the oil coming out will be less because the volume of the air above the oil increases and hence the pressure of the air decreases, obstructing the flow. When the pressure of air above oil plus pressure due to height column of oil becomes less than atmospheric pressure, the oil stops to ooze out.
If another hole B is made which is diagonal to the first hole, atmospheric air from this hole keeps on entering and hence pressure at A remains greater than atmospheric pressure and hence oil will continue to flow out from the tin.
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