Physics
Air moves from the region where the air ________

Pressure is high to the region where the pressure is low
Humidity is high to the region where the humidity is low
Pressure is low to the region where the pressure is high
Humidity is low to the region where the humidity is high

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Physics
In a railway track, two rails are joined end to end with a gap in between them because

Accidents due to expansion in summer can be avoided
Accidents due to contraction in winter can be avoided
Air-gaps are necessary for bearing the weight of running train
Steel can be saved

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