We usually eat low-calorie staple foods such as steamed bread and rice. Rice contains heat per 100 kg 1 16000 calories. Imagine how low the calories of sweet corn are. Every 100g sweet corn contains 86 kcal, protein 3.27g, carbohydrate 18.7g, dietary fiber 2g and fat1.35g.
Every 100g waxy corn contains energy 144 calories, protein 3.6g, carbohydrate 29.6g, dietary fiber 7.4g and fat1.8g. Comparing the two, we can quickly find that the calories of sweet corn are lower than those of waxy corn, and people in the fat-reducing period are more suitable to eat sweet corn than waxy corn.
Heat and internal energy
The relationship between heat energy and internal energy is just like the relationship between work and mechanical energy. Heat is a measure of the change of internal energy in an object. If the two areas do not reach thermal balance, then the heat will be transferred from the place with high middle temperature to another place with low temperature. Any substance has a certain internal energy, which is related to the disorderly movement of atoms and molecules that make up the substance. When two substances with different temperatures are in thermal contact, they exchange internal energy until the temperature is the same, that is, they reach thermal equilibrium. Here, the energy transferred is equal to the heat exchanged.
Many people confuse heat energy with internal energy. Heat actually refers to the change of internal energy and the work done by the system. Heat describes the change of internal energy, which is a state quantity and state function of the system, corresponding to a state point of the system. Fully understanding the difference between heat and internal energy is the key to understanding the first law of thermodynamics. In the process of heat transfer, the heat transferred between objects is related to the process (adiabatic, isothermal and isobaric), that is, the absorption or release of heat must be carried out in a certain process. When an object is in a certain state, it cannot be said how much heat it contains (heat is a process quantity and a variable).