Energies per unit mass

Imagine you have a bag of different types of food, like fruits, vegetables, and candy. Each type of food has a different amount of energy that it can give to your body when you eat it. Now, imagine dividing the total amount of energy in the bag by the weight of the bag. This will give you the amount of energy per unit mass, or energy per unit weight.

Similarly, in physics, we measure the energy of different things, like motion, heat, or light, and divide that energy by the mass of the object or substance. For example, a moving car has kinetic energy, and we can calculate the kinetic energy per unit mass of the car. This helps us compare the energy content of different objects or substances, even if they have different sizes or masses.

In summary, energy per unit mass is a measure of how much energy is stored in an object or substance per unit of its mass or weight, like the amount of energy in a bag of food per kilogram of weight.