Pressure can affect the density of solids liquids gases metals

Answer;

-Gases

Explanation;

-Pressure can affect the density of gases.

-Density of gases changes with pressure and temperature because gases are compressible fluid and because they are compressible, when pressure increases molecules come closer to each other which means increase in density and when pressure drops molecules of gases become free to expand and get away from each other which density decrease.

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

an energy transformation flow diagram is shown

where is it ?