Temperature.

In physics, temperature is a physical property of a system that underlies the common notions of hot and cold; something that feels hotter generally has the higher temperature. Temperature is one of the principal parameters of thermodynamics. If no heat flow occurs between two objects, the objects have the same temperature; otherwise heat flows from the hotter object to the colder object. This is the content of the zeroth law of thermodynamics. On the microscopic scale, temperature can be defined as the average energy in each degree of freedom in the particles in a system. Because temperature is a statistical property, a system must contain a few particles for the question as to its temperature to make any sense.

The temperature practicly show us the heat of bodys,the difference between the clod and hot things.

Temperature is measured with thermometers that may be calibrated to a variety of temperature scales. In most of the world (except for Belize, Myanmar, Liberia and the United States), the Celsius scale is used for most temperature measuring purposes.

Thermometer.

An instrument used to measure temperature. There are many types of thermometers; the most common consist of a closed, graduated glass tube in which a liquid expands or contracts as the temperature increases or decreases. Other types of thermometers work by detecting changes in the volume or pressure of an enclosed gas or by registering thermoelectric changes in a conductor (such as a thermistor or thermocouple).

Types of thermometers.

primary thermometers the measured property of matter is known so well that temperature can be calculated without any unknown quantities. Examples of these are thermometers based on the equation of state of a gas, on the velocity of sound in a gas, on the thermal noise (see Johnson–Nyquist noise) voltage or current of an electrical resistor, and on the angular anisotropy of gamma ray emission of certain radioactive nuclei in a magnetic field. Primary thermometers are relatively complex.

Secondary thermometers are most widely used because of their convenience. Also, they are often much more sensitive than primary ones. For secondary thermometers knowledge of the measured property is not sufficient to allow direct calculation of temperature. They have to be calibrated against a primary thermometer at least at one temperature or at a number of fixed temperatures. Such fixed points, for example, triple points and superconducting transitions, occur reproducibly at the same temperature.

Types of burns

Burns are generally put into three categories. These classes are first, second and third degree burns. The burn category indicates the severity of the burn along with the amount of body area.

FIRST DEGREE BURNS

The first-degree burn usually produces a pink to reddish color on the burned skin. Mild swelling, tenderness and pain are also symptoms of a first-degree burn. This is the least serious type of burn and involves only the upper layer of skin, the epidermis. For these minor burns, the victim should cool with plain water and use non-prescription antibiotic creams. These burns usually heal on their own within a few days with little or no scarring. However, if a first-degree burn is over a large area of the body, seek emergency medical attention. Also, if an infant or elderly person suffers any type of burn, even minor, obtain medical assistance promptly.

SECOND DEGREE BURNS

Second-degree burns involve the epidermis and the second skin layer, the dermis. The epidermis is destroyed and burned-through in a second-degree burn. There are the same symptoms of pain and swelling but the skin color is usually a bright red and blisters are produced. Usually second-degree burns produce scarring. Second degree burns may take from one to three weeks to heal but are considered minor if they cover no more than 15% of the total body area in adults and 10% body area in children. These burns require medical attention and medication to heal properly. Call for immediate medical help as soon as the burn occurs and do not apply any type of butter or greasy substance to the burn. This can hamper cooling of the burn area and also do further damage. Consult medical personnel about whether or not to administer fluids to victim before arriving at a hospital.

THIRD DEGREE BURNS
The third-degree burn may appear charred or have patches which appear white, brown or black. Both the dermis and epidermis are destroyed and other organs, tissues and bones may also be involved. Third-degree burns are considered the most serious. They produce deep scars that many times require cosmetic or reconstructive surgery and skin grafts. Pain may or may not be present since usually nerve endings which transmit pain have been destroyed in this type burn.