what is temperature?

Question

what is heat, convection, conduction, radiation

Answer 1

Temperature - a measure of the warmth or coldness of an object or substance with reference to some standard value. The temperature of two systems is the same when the systems are in thermal equilibrium. The degree of hotness or coldness of a body or environment. A measure of the average kinetic energy of the particles in a sample of matter, expressed in terms of units or degrees designated on a standard scale. The degree of heat in the body of a living organism, usually about 37.0°C (98.6°F) in humans. An abnormally high condition of body heat caused by illness; a fever.

Heat -
1. the state of a body perceived as having or generating a relatively high degree of warmth.
2. the condition or quality of being hot: the heat of an oven.
3. the degree of hotness; temperature: moderate heat.
4. the sensation of warmth or hotness: unpleasant heat.
5. a bodily temperature higher than normal: the heat of a fever; the feeling of heat caused by physical exertion.
6. added or external energy that causes a rise in temperature, expansion, evaporation, or other physical change.
7. Physics. a nonmechanical energy transfer with reference to a temperature difference between a system and its surroundings or between two parts of the same system. Symbol: Q
8. a hot condition of the atmosphere or physical environment; hot season or weather.
9. a period of hot weather.
10. a sharp, pungent flavor, as that produced by strong spices.

Convection - Physics. the transfer of heat by the circulation or movement of the heated parts of a liquid or gas. Heat transfer in a gas or liquid by the circulation of currents from one region to another. Fluid motion caused by an external force such as gravity.

Conduction - the transfer of heat between two parts of a stationary system, caused by a temperature difference between the parts. transmission through a conductor.

Radiation -the process in which energy is emitted as particles or waves. the complete process in which energy is emitted by one body, transmitted through an intervening medium or space, and absorbed by another body. the energy transferred by these processes. the act or process of radiating. something that is radiated. radial arrangement of parts

Hope these will help you!

Answer 2

Temparature is a way of measure how much heat energy a body has.

Heat is a form of energy a body can posses. It is due to the vibration of the atoms/ions/molecules that make up the body.

Conduction, convection and radiation are three ways that heat energy transfers from place to place.

Answer 3

Convection -: Transfer of heat by flow of something i.e. air
Example -: Electric Oven

Conduction-: Transfer of Heat through contact.
Example-: Heat up a pin with a lighter, it will soon get hot at the end you are not heating up.

Radiation-: Heat by transfer of Electromagnetic Waves
Example-: Microwave Oven

Answer 4

TEMPERATURE is a measure of the HEAT of a substance.

HEAT is a certain type of energy that substances possess to a greater or less degree depending on the vibrational energy of the substances constituent particles.

ie. the more the particles vibrate, the more heat (ie hotter) the stuff is... the more THERMAL ENERGY it has.

CONVECTION is a way of passing heat from one part of the substance to another (heat transfer mechanism). In convection, the greater heat in one part of a liquid or gas causes the particles to vibrate with greater energy and to move about more. This will tend to cause these hot (higher energy) particles to distribute more throughout the liquid or gas - usually these particles will tend to rise up and heat up the cooler portions of the gas or liquid.

CONDUCTION is a way of passing heat from one part of the substance to another (heat transfer mechanism). This usually occurs in solids. When one end of a solid is hotter than the other end, the hotter particles vibrate more and transfer their heat along the solid and spread the thermal energy so that eventually the entire solid will be hotter.

RADIATION is a way of passing heat from one substance to another (heat transfer mechanism). In this form of heat transfer, thermal energy becomes infra-red electromagnetic energy in the form of infra-red radiation.

See the wiki pages

Answer 5

Temperature is the degree of hotness and coldness of a body.
Heat is the state of hotness of a body.
Convention is the transfer one heat from one region to another.
Conduction is the transfer of heat from one object to another via a meduim.
Radiation is the transfer of heat via waves and rays.

Answer 6

Temperature is a measure of the average energy of motion of the particles of a substance.

Heat is energy transterred from hotter substances to colder ones.

Convection is the transfer of heat by the movement of particles from one part of a fluid to another.

Conduction is the transfer of heat by the collisions of particles in a solid.

Radiation is the transter of energy by means of waves.

Answer 7

temperature is a measurement directly proportional to the average kinetic energy of a substance. KE=(1/2)mv^2

Answer 8

The Universe is made up of matter and energy. Matter is made up of atoms and molecules (groupings of atoms) and energy causes the atoms and molecules to always be in motion - either bumping into each other or vibrating back and forth. The motion of atoms and molecules creates a form of energy called heat or thermal energy which is present in all matter. Even in the coldest voids of space, matter still has a very small but still measurable amount of heat energy.


Energy can take on many forms and can change from one form to another. Many different types of energy can be converted into heat energy. Light, electrical, mechanical, chemical, nuclear, sound and thermal energy itself can each cause a substance to heat up by increasing the speed of its molecules. So, put energy into a system and it heats up, take energy away and it cools. For example, when we are cold, we can jump up and down to get warmer.

Here are just a few examples of various types of energy being converted into thermal energy (heat).

(1) Mechanical energy is converted into thermal energy whenever you bounce a ball. Each time the ball hits the ground, some of the energy of the ball's motion is converted into heating up the ball, causing it to slow down at each bounce. To see a demonstration of how this happens click here



A thermal infrared image of a ball before (left) and after (right) being bounced.
(2) Thermal energy can be transfered to other objects causing them to heat up. When you heat up a pan of water, the heat from the stove causes the molecules in the pan to vibrate faster causing the pan to heat up. The heat from the pan causes water molecules to move faster and heat up. So, when you heat something up, you are just making its molecules move faster.

(3) Electrical energy is converted into thermal energy when you use objects such as heating pads, electrical stove elements, toasters, hair dryers, or light bulbs.



A thermal infrared image of a hair dryer and a flourescent light bulb.
(4) Chemical energy from the foods we eat is converted into heating our bodies.

(5) Light from the sun is converted to heat as the sun's rays warm the earth's surface.

(6) Energy from friction creates heat. For example when you rub your hands, sharpen a pencil, make a skid mark with your bike, or use the brakes on your car, friction generates heat.



A thermal infrared image of a pencil after being sharpened (left) and of hot brakes in a car (right). Notice the hot tip of the pencil.
There are many other examples. Can you think of some more?

The more energy that goes into a system, the more active its molecules are. The faster molecules move, the more heat or thermal energy they create. So, the amount of heat a substance has is determined by how fast its molecules are moving, which in turn depends on how much energy is put into it.


ACTIVITY:
Let students pretend to be molecules. First have them stand still and close together. Then have the students wiggle and then walk and move around to demonstrate more energy entering the system. Have them move faster and jump up and down as even more energy enters the system. Then have the students stop and notice where they are. They should be much farther apart and should feel much warmer than they were originally.



Although molecules are too small to see, we can detect and measure their movement.


EXPERIMENT:
To do this experiment you will need 2 clear bowls and food color. Fill one clear bowl with hot water and another with the same amount of cold water. When the water is still, put a drop of food color into the center of each bowl. As the water molecules bump into the food color molecules, the food color will move around. Since the hot water molecules are moving faster, they will bump into the food color harder and more frequently causing it to spread more quickly than the food color in the cold water.