The Principal of heat transfer in everyday life — is a redistribution of temperature by heating, radiation or convection. Different materials have different from other properties. Good conductors are all metal products.
There are basic types of heat transfer in everyday life: thermal conductivity (between solids), convection (relevant to gas environments), radiation (transfer of heat in a contactless manner). Heat transfer refers to the action of energy conversion within the subject without the realization of the external influence on him. Heat transfer occurs due to internal processes.
Types of heat transfer in everyday life:
The processes Listed above describe only some types of heat transfer in everyday life. Heated air from a battery is an example of convection is when energy is passively transferred from the solid to the gaseous substance. This process is described as interaction of the molecules among themselves.
To Consider examples of heat transfer in nature and everyday life easier for the metal objects. They have the highest thermal conductivity. Include such copper terminals (tripods, wire, pipes, springs), steel and alloys.
Evidence of heat transfer is the glass thermometer. Steel foot is in contact with the mercury, is heated by the human body. Liquid substance begins to expand, we see a built-in scale.
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Plastic transfer heat too well. The process we observed in the process of charging a smartphone, tablet or laptop. The back cover is always warmer. There is a redistribution of internal energy.
We Studied the types of heat transfer in nature, life is everywhere. In a conventional kettle, the heat from the metal case is transferred to the liquid. And she, in turn, heats the handle of a plastic material. The transfer of energy in the latter case at the expense of the couple.
Heat transfer in nature, technique, everyday life depends on many conditions. Soprikasalis with each other the materials transmit energy in different ways. This can be seen on the example of the conventional window. Between the glass surfaces intended span of the air gap. The latter is poorly transfers heat.
The Glass surface quickly accept and give energy. Porous materials have virtually zero conductivity. Therefore, they are used for insulation of facades of buildings in construction.
Evidence of different thermal conductivity is clothing made from different properties of the tissues. Wool and other fluffy materials do not conduct heat. And the waterproof fabric (synthetic) transmits the energy immediately. So the product of these tissues are cold in the winter.
In the morning, pouring a Cup of hot tea, which we can see the types of heat transfer? Their registration and use in everyday life will look like this:
For a rational flow of the air in the room vents on the Windows are located upstairs. Heat always rises and cold air from outside helps to distribute energy in the room. When we open the window, freezing in the first place his feet. This unevenness is equalized by convection.
There are some particularities of different types of heat transfer. The predominantly convection heat transfer occurs due to the mixing of gases. Molecules transfer energy through contact. At the end of the process, the temperature in a closed volume is aligned. After closing the window in the room air temperature is the same everywhere, if there are no other sources of heat or cold.
Heat transfer depends on the type of material. So, steel and copper after contact will vary according to temperature. This is due to the different properties of energy transfer. Heated metal object does not heat the cork material. Spoon in the tea glass is heated so that it will be impossible to take up. However, it can be made of aluminum alloy, and it has low thermal conductivity.
Radiation is observed in all the above examples. Due to this phenomenon is negligible loss of energy. Household appliances, this phenomenon occursparticularly strong: in heaters, irons, soldering irons. Notice the rays, holding the hand at a distance from the heating surface. Felt has small heat — this is due to the infrared radiation.
Used all kinds of heat transfer in nature, life, technology. The radiation of the infrared spectrum can be found in medical devices. It has a positive effect on the surface of the body. Thus warm up the muscles, joints, internal organs.
In nature the main source of heat is sunlight. It radiation warms the planet Earth. All plants feed on this energy. The seas and oceans, the air are set in motion. Winds are formed under the influence of the infrared spectrum.
The Radiation into account in the manufacture of all the appliances operating from the electrical current. Mobile phone devices are heated constantly. It is therefore not recommended to place the smartphone in the region of the heart.
For a simple experiment, you will need copper wire a small length. Bare the two ends, one of which we take in hand. The second is placed over a flame or in boiling water.
Gradually, both ends become hot. But in the field of insulation the wire can safely hold. It is a proof of the thermal conductivity. For experience with convection is sufficient to open the window. The items below will be cooler than near the ceiling. After closing the vents, the temperature of the bodies will be equal.
You can feel the Radiation from any hot object. In the distance there is a transfer of heat. When the melting of ice in the distance felt cold. Invisible rays can be felt by the hand if you shove it into the space of the freezer of the refrigerator.
The thermal conductivity of the felt in the washing machine. Enough to touch the hatch cover when heating the water. The wax candle is needed to reduce heat, so it burned longer.
Proof of thermal conductivity can be obtained by heating the steel and silver spoons. The two metals have different properties of energy transfer. At the end of the handle of each spoon to apply the wax. Next, heat both pieces from the same heat source on the other side.
A steel spoon the wax will melt much earlier that indicates the best thermal conductivity. Instead of wax you can take a piece of frozen butter or margarine to experience at home.
The Second experience proves the dependence of the thermal conductivity of the material. You will need dark and light dummies. Both vessels are heated to boiling of water and note the time of cooling each.
The laws of physics dark kettle cools down longer. This proves that the light materials are heated less. Therefore, in the hot season to wear white waistcoats. Because the sun's rays are attracted to black cloth.
In the cold we wear warm scarves, to avoid the icing of the face. So, in a woolen mitten hand is absolutely not freezing in the freezer. This speaks to the low thermal conductivity of the material.
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Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."
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