carbohydrate
yes it is a food substance that provide energy
Humans convert glucose into energy. Salt is a substance to add taste to food
When is food turned into energy
carbohydrates and fat
For example, when ice is melting, the absorbed thermal energy is used to change the phase of the substance - a type of potential energy.
energy energy
Enzymes are used to break down food.
Glucose
Chlorophyll
Geothermal energy is energy. It does not change into a substance, although it cam be transformed into other forms of energy. When it is not used directly to heat buildings, geothermal energy (heat) is typically used to run turbines for conversion to electrical energy
The sun's energy is used to grow food, you eat and digest the food and get energy from it.
Calorie is the unit used to express chemical energy in food.