What is used to study the waves ?

Buoys can be used to measure the height, period and direction of waves. The buoy can even measure its own acceleration – this can tell scientists whether it is falling from the top of a high wave into a trough.:

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

the temperature in kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor of four. what is the final volume of the gas