Physics
Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open

at a place in a valley below sea level
at sea level
in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level
at the top of Mt. Everest

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Physics
The sky appears blue because

In white light, the blue component dominates
The atmosphere scatters blue colour more than the others
All colours interfere to produce blue
It is actually blue

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