What happens to the temperature of air  when it expands?

During an all-night cram session, a student heats up a 0.807 liter (0.807 x 10- 3 m3) glass (Pyrex) beaker of cold coffee. Initially, the temperature is 15.5 °C, and the beaker is filled to the brim. A short time later when the student returns, the temperature has risen to 98.0 °C. The coefficient of volume expansion of coffee is the same as that of water. How much coffee (in cubic meters) has spilled out of the beaker?

A steel rod is measured with an aluminum tape at 25 degrees Celsius. The reading is exactly 1.000 m long. If both the aluminum tape and steel rod are cooled to 0 degrees Celsius, the aluminum tape measure’s “reading” will be more than 1.000 m, the same as 1.000 m, or less than 1.000 m.

Your car’s radiator is made of steel and is filled with coolant. You fill the radiator to the very top with coolant, then drive off without remembering to replace the cap. As the coolant and steel radiator heats up, will the level of coolant drop or rise and overflow? why? what is a radiator is and what purpose does it serves in a car?  Here is a good start: https://youtu.be/y5p31F_dVJU