Heat means that when the change of system state comes from the destruction of thermal balance conditions, that is, from the temperature difference between the system and the outside world, we say that there is thermal interaction between the system and the outside world.
As a result, energy is transferred from a high-temperature object to a low-temperature object, and the transferred energy is called heat. Heat and work are two different forms of energy transfer with the change of system state, and they are the measures of different forms of energy transfer. They are all related to the intermediate process of state change, so they are not functions of system state.
The daily calories required by human body are related to the degree of physical activity. Generally speaking, a person with a standard weight of 60 kg needs 1500- 1600 calories a day at rest; If the activity is moderate, you need 1800- 2000 calories a day.
Extended data:
Fresh orange is rich in vitamin C, fruit acid, vitamin B 1, vitamin B2, nicotinic acid, protein, crude fiber, iron, calcium and phosphorus. Drinking a proper amount of orange juice every day is conducive to promoting digestion, supplementing the deficiency of vitamins in breast milk and milk, increasing resistance, promoting growth and development, and preventing scurvy.
For people with bad teeth and poor digestion, it is difficult to ensure that they eat enough fruits and vegetables every day. At this time, juicing yourself is a good way to supplement.
In addition, if you can't eat all the fruits at home, you might as well take out the extra fruits and squeeze some every day, which can not only supplement nutrition, but also make effective use of food resources!
References:
Baidu encyclopedia entry-freshly squeezed orange juice