In a car cylinder, a piston moves up and down inside a cylinder, causing the substance inside to expand and contract. which type of substance could be inside the cylinder?
gas only
liquid only
liquid or solid only
gas, liquid, or solid

A piston cylinder system usually makes use of a gas as the substance that is expanded and contracted. Internal combustion engines are used in cars to convert fuel into mechanical energy. The continuous up and down motion of the piston causes the crankshaft to rotate, which also does work to power the car. 

Deposition is the transition of matter going from gas to solid without passing through the liquid phase.a.) gas—-> solid

You would be correct, boiling water does disinfect contamination.    the property of disinfecting means to kill  germs, bacteria and other pathogens or contamination  that might cause an infection or cause a person to become sickly. a couple methods of disinfecting are using soap, other cleaning supplies or by simply "boiling" the contaminate.  the reason why boiling water disinfects certain attributes is because some cells cannot survive the heat and pressure.