Staple food: If 80 calories is taken as a unit of calculation,1/4 bowls of rice, half bowls of porridge or half bowls of noodles (ordinary bowls commonly used in daily life) are all equivalent to 80 calories.

Vegetables: 600g of any vegetable is equivalent to 80 calories.

Fruit: 300g watermelon and 2 oranges have about 80 calories.

Meat: The calories of 37g lean meat and 20g fat meat are 80 calories.

Seafood:/kloc-about 0/00g of seafood has 80 calories.

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Heat means that when the change of system state comes from the destruction of thermal equilibrium 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 energy transferred at this time is called heat.

Heat and work are two different forms of energy transfer that accompany the change of system state, and they are 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.

Reference: Baidu Encyclopedia Heat