What is the definition of chemical reaction

Describe five factors that influence the value of fuel

Compare the depth of field when focusing with low power and high power. which power has the greater depth of field?

Which best explains how a heat pump can heat a room? cold air from the house is moved through pipes, where it absorbs thermal energy. warm air from outside is pushed into the house to replace the cold air. combustion warms the air when chemical energy is transferred to thermal energy. fuel is used to move a piston, which pushes warm air into the house.