Why do people feel hot when the temperature of the object is high?

Temperature is considered to be a quantity directly related to the average kinetic energy of a molecule, and objects of equal temperature are in thermal equilibrium. Thermal conduction means that the kinetic energy of the molecules of object A is greater than that of object B, and this kinetic energy is transferred through the collision of surface molecules, and finally the temperature of the two objects is equal, that is, thermal equilibrium.

For your question, if you feel hot when you touch an object with your hand, it is indeed the object that transfers heat to your hand through the process described above.

Produced by an increase in hand temperature. This change then activates the thermoreceptors in the hand, which are transmitted to the spinal cord through the dorsal neurons, and then uploaded to the posterior gyrus of your brain, so that you perceive it.

The perceived temperature of the human body is between 20 and 47, when the water temperature exceeds 36, there will be a sense of temperature, when it exceeds 45, it will obviously feel hot, when the water temperature exceeds 50, there will be a hot feeling, and when it exceeds 60, it will form a scald. The longer the exposure, the more severe the burn will be. The contact time is recommended not to exceed 4 seconds.

Summary: The temperature at which the human hand feels hot starts from 50, and the longer the contact time, the more serious the scald, which is easier than the scald that touches 10 seconds at 60 water temperature than the scald that touches 16 seconds at 57 water temperature. In order to avoid burns, do not touch hot objects, and take protective measures before touching again.

Because people also feel it, when they feel that the temperature is not suitable, they will definitely feel hot.

When the human body feels harm, there are some natural reactions.

Because the nerve center of the human brain senses the pain caused by the outside world.

Because people's ** will have induction to send, the brain will have these.

Because it is an injury, it can cause pain to the person.

It is the cells that signal that the body may be harmed.

Because the human body is a homeothermic animal, it can make judgments about the outside world.

Because the questioning regulation center gives signals to the brain.

Because the human body can make judgments about the outside world at 37 degrees.

People will perceive that the heat rate is not only the ambient temperature higher than the body temperature, but also the thermosensitive cells and central regulatory system on the body surface. When the surface of your body feels cold, this signal is transmitted to the brain, which burns your calories to provide energy. However, this energy is not converted by fat, but by the glucose in your body, so obesity cannot convert energy for you in addition to providing an insulating layer!

After listening to this, will you feel that your fat is useless?

The essence of heat is the movement of microscopic matter.

Thermal energy refers to the energy possessed by the thermal motion of a microscopic substance.

The essence of temperature is the speed at which microscopic matter moves. The faster the microscopic matter moves, the higher the temperature.

Thermal motionThermal motion refers to the movement of microscopic substances. The forms of thermal motion are divided into flow, vibration, and spin.

1.The form of thermal motion of the molecule is vibration.

Thermal motion of gas molecules. At room temperature and pressure, the average velocity of air molecules is 500 meters per second, and in 1 second, each gas molecule collides with each other 50 billion times. For example:

Once the jasmine blooms, the whole family and even the neighbors can smell the fragrant aroma. Rotting fish and meat will make the surrounding area stench.

Thermal motion of liquid molecules. For example, if you put 1 drop of ink in a glass of water, the ink will slowly spread out and mix completely with the water.

This indicates that the molecules of one liquid are moving into another liquid, or that the molecules of the liquid are constantly moving. Using one cup of hot water and one cup of cold water, drop 1 drop of red ink into each cup and find that the red ink in the hot water cup spreads faster than the cold water cup. This illustrates:

The higher the temperature, the greater the speed of movement of the molecules.

In 1827, Brown in England put Garcinia cambogia powder into water, and then took out 1 drop of suspension and observed it under a microscope and found that the small particles of Garcinia cambogia kept moving in the water, and the direction and speed of each particle changed very quickly, as if they were dancing a chaotic dance.

Thermal motion of solid molecules. For example, if you press a lead plate with a very smooth and clean surface on a gold plate, you can find that after a few months, the lead molecules have escaped into the gold plate, and the gold molecules have also escaped into the lead plate, and in some places even into a depth of 1 millimeter.

If left for 5 years, the gold and lead plates will be joined together, and their molecules will enter each other by about 1 centimeter.

2.The form of thermal motion of atoms is spin. The faster the spin speed of an atom, the larger its vortex radius and the larger its volume.

3.The thermal motion of electrons takes the form of rotation of the nucleus. The spin of the nucleus and the rotation of the nucleus of the electron are mutually causal.

The spinning electrons of the Rao nucleus collide with photons to produce light. The faster the electron nucleus rotates, the higher the frequency of the photon.

4.Plasma thermal movement. When the temperature of the atom reaches a certain point, the electrons separate from the nucleus and become plasma.

For example, the solar wind flows at a speed of 200 800 km/s.

Because when the outside temperature is higher than its own temperature, the body cannot expel enough heat, so it feels hot. The essence of heat is infrared light, which is electromagnetic waves, and temperature reflects the strength of the energy propagating outward (electromagnetic waves) of an object.

Because the human cerebral cortex can sense the temperature, just as we can feel pain. Heat is actually electromagnetic waves, and the higher the temperature, the stronger the ability of an object to propagate electromagnetic waves outward.

Because there is a temperature sensor in the human body, it can feel the temperature changes in the outside world. The essence of heat is the energy of the movement of photons.

The rise in temperature will make the human body feel heat, which is actually a kind of self-protection of the human body, and too high a temperature will make the cells in the body unable to survive. The essence of heat is actually temperature, which refers to the speed at which particles move.

Why is the perm heated at such a high temperature, hello, the reason is that the normal hair quality is generally 138 to 140, you can heat it for 15 minutes first, add 5 more minutes after cooling, and if the damaged hair is below 135, heat it for 12 to 15 minutes, and then heat it for 3 to 5 minutes. 2. The difference between hot perm and cold perm, due to the difference in the performance of the first dose of hot perm potion, about 65-75% of the secondary fluidization bonds are cut off, the basic principle is the same as before and before cold perm, and hot perm is to change the protein structure of the hair, so that the protein is tight and change the hairstyle, but cold perm is to use the cutting of the secondary fluid bonds, and then reconnect to achieve the curl, when the hot perm core is powered, a large amount of heat is released, so that the inside of the hair is heated, and curls begin to form. The whole process of perming takes about 3-4 hours.

Blanching is an important step in fruit and vegetable processing. Blanching can blunt enzymes that adversely affect product quality, reduce the number of microorganisms, remove oxygen from tissues, and prepare for further processing. The passivation of some oxidases is conducive to the preservation of vitamins in the product, but the loss of vitamins in blanching is large, mainly due to oxidation and loss of dissolved water in Xiaoliang, followed by thermal degradation.

Secondly, blanching is enough to reduce the vegetative cells of microorganisms and kill some of the bacteria, especially those that remain on the surface of the product. It is also believed that blanching removes air between the cells of fruits or vegetables, which is very beneficial for canned products before sealing. Finally, blanching enhances the color of most fruits and vegetables.

The temperature of the object does not necessarily increase after it absorbs heat.

The internal energy of an object must increase after absorbing heat, but the temperature does not necessarily increase, but the premise is that the object does not exert pressure on other objects and does not transfer heat to other substances.

For example: 1. When the crystal melts, one of the processes of the limb melting curve is the process of continuously absorbing heat but not increasing the temperature;

2. When the water is at zero degrees, the ice-water mixture will melt, and the temperature of the ice-water mixture will still be zero when the ice is not completely melted, so the heat of the object will not necessarily rise.

Not necessarily, the ice-water mixture appears at 0 degrees Celsius, at which time the heat-absorbing ice will melt, and when the ice is not completely melted, the ice-water mixture will still be 0 degrees, so it will not necessarily heat up

1) The friction heat generation of Mofufeng is to overcome the friction to do work, so the internal energy of the object increases, so the "heat" here refers to the internal energy (2) The increase in the heat absorption temperature of the hall refers to the increase in temperature after the object absorbs heat, so the "hot" here refers to the heat (3) Today's weather is really hot is a reflection of the degree of cold and heat of the weather, so this "hot" refers to the temperature So the answer is: internal energy; Heat; Temperature

A: Sometimes, human sensation is unreliable, so it is not right to feel that the temperature of an object that is hot must be high. i.e. awrong;

The units of temperature are: pure Lit, Celsius ( ), Oak Kelvin (referred to as Kai-K), Fahrenheit, etc. The SI unit is kThe so-called "degree" of daily life is not standardized, so B is wrong;

c Correct; So there is a right side, there is a wrong option, so D is wrong.

To sum up, the correct answer is C