For many people, some terms are not clear to them. For example, are the two words "calories of food" and "energy" the same? What is the difference between calories and calories? After talking about it for a long time, some people may be confused. So do you think heat is energy? Are calories calories? Let’s go take a look below!
What does heat mean?
Heat refers to the thermal energy The energy transferred between the system and the outside world depends on the temperature difference. Heat is a process quantity, so heat can only be said to be "absorbed" and "released". You cannot say "contains" or "has". And this transfer process is called heat exchange or heat transfer. The unit of heat is joule (J). All life activities of the human body require energy, such as synthetic reactions of material metabolism, muscle contraction, gland secretion, etc. And these energy mainly come from food. Nutrients contained in animal and plant foods can be divided into five categories: carbohydrates, lipids, proteins, minerals and vitamins, and six categories when added to water. Among them, carbohydrates, fats and proteins can release energy when oxidized in the body. The three are collectively referred to as "energy-producing nutrients" or "pyrogens".
There are three main parts in the way of calorie consumption. The first part is the basal metabolic rate, which accounts for about 65~70% of the total calorie consumption of the human body. The second part is physical activity, which accounts for about 15% of the total calorie consumption. ~30%. The third part is the thermal effect of food, which accounts for at least about 10%. The proportions of these three have been roughly fixed.
Is heat energy?
Heat is a type of energy, and generally more calories are used in food. Energy is mostly used in physics. When food is eaten into the stomach, it is converted into calories, a large part of which fills the needs of the human body, supplies the human body, and is converted into useful energy. The rest that is not consumed is excess calories.
Heat is a type of energy. The relationship between the two is like an egg yolk and an egg. The symbol of energy in physics is generally E, and its international unit is Joule (J), which is commonly used except Joule. The units of heat also include kilojoules (KJ), kilowatt hours (kW·h) and calories. The international standard unit of heat is also joules.(J), The unit of heat has been defined as cal in history, but it is currently only used as an auxiliary unit of energy, 1 cal = 4.184 joules. 1 kilocalorie = 1 calorie = 1 kcal = 4184 joules = 4.184 kilojoules.
Is heat a calorie?
A calorie is defined as the amount of heat required to raise 1 gram of water by 1 degree Celsius at 1 atmosphere of pressure. Since the unit "calorie" is still too small compared to our daily intake of calories, nutrition science now generally uses another unit "kilocalories" (kcal or C, also known as "kcal") that evolved from "calories". 1 kcal is equal to 1000 calories, approximately 4186 joules. The calories of fat are about 9 kilocalories per gram; the calories of sugar and protein are only 4 kilocalories per gram.