I would like to give you an example "Pressure Cooker". The pressure level inside the Cooker is increased to 15 PSI(Pounds per square inch). So the rise is cooked at the temperature 120 degree Celsius. Therefore, the rise is cooked in 15 minutes. If you cook the rise in an open vessel, it will take up to 30 minutes to cook the rise. Because the rise is cooked in 100 degree Celsius (because of the normal atmosphere which is less than that inside the Pressure cooker). That's why it takes much time to cook. Similarly, in the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100 degree Celsius causing an increase in cooking time.

Inertia is an external force which create tension to the object in respect of gravity it can be in any direction.

It is an optical illusion in which atmospheric refraction by a layer of hot air distorts or inverts reflections of distant objects.

At high altitude pressure is less, pressure difference can damage the plane because there will appearer a thrust on plane from high pressure to low pressure. In order to avoid from damage air pressure inside the plane is adjusted by using air pumps.