Answer:
J (joule) W(watt)
Explanation:
If you're looking for the definition it is
The most common definition of energy is the work that a certain force can do. Energy also cannot be created or destroyed and some examples are
light, heat, mechanical, potential, and kinetic
Because the kiln utilizes fire, fire uses oxygen and the fuel to create CO2
CO2 would be the main gas because the main components of the reactants are carbon and oxygen, which make up CO2