A red giant forms when a main sequence star that has been contracting suddenly expands and cools.
It grows to such an extended size that it exceeds the standard dimensions of the page, and a fold-out is required.
When a parcel of air moves upward, it expands and cools due to the altitude.
It expands and cools
the Mercury in a thermometer expands when heated and contracts when the temperature cools down.
rising air expands then cools and condenses
clouds
CLOUDS
When rubber is heated it expands and when it cools it contracts.
Air doesn't expand when it cools it contracts. any easy way to prove this point is to blow up a balloon put it in the fridge and leave it there for a while it will become smaller take it out of the fridge and it will get bigger again. Air expands as it heats and contracts as it cools.
The explanation of Thermal Expansion.
as preasure increase tempreture decrease
As the Mercury is heated it expands and as is cools it contracts. It is used because it also heats and cools in even intervals that are easy to track in a metric system.