This is a picture of a red blood cell.Lacking a nucleus and organelles such as mitochondria, the mammalian red blood cells do not use any of the oxygen they transport for their own needs.
Wednesday, June 30, 2010
This is a picture of a red blood cell.Lacking a nucleus and organelles such as mitochondria, the mammalian red blood cells do not use any of the oxygen they transport for their own needs.
Saturday, February 27, 2010
Friday, February 26, 2010
group 7 post 2
Digital thermometer
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Infrared thermometer
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laboratory thermometer
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DIFFERENT TYPES OF THERMOMETERS
Many methods have been developed for measuring temperature. Most of these rely on measuring some physical property of a working material that varies with temperature. One of the most common devices for measuring temperature is the glass thermometer. This consists of a glass tube filled with mercury or some other liquid, which acts as the working fluid. Temperature increases cause the fluid to expand, so the temperature can be determined by measuring the volume of the fluid. Such thermometers are usually calibrated so that one can read the temperature simply by observing the level of the fluid in the thermometer. Another type of thermometer that is not really used much in practice, but is important from a theoretical standpoint, is the gas thermometer.
Other important devices for measuring temperature include:
Thermocouples
Thermistors
Resistance Temperature Detector (RTD)
Pyrometers
Langmuir probes (for electron temperature of a plasma)
Infrared
Other thermometers
http://en.wikipedia.org/wiki/Temperature_measurement
done by:Nicole,Amanda,Mika and Alisha
Temperature(group 7)post one:)
Thermometer with Fahrenheit units on the outer scale and Celsius units on the inner scalehttp://en.wikipedia.org/wiki/Fahrenheit
A Wrong Idea
Often the concepts of heat and temperature are thought to be the same, but they are not.
Perhaps the reason the two are usually and incorrectly thought to be the same is because as human beings on Earth everyday experience leads us to notice that when you heat something up, say like putting a pot of water on the stove, then the temperature of that something goes up. More heat, more temperature - they must be the same, right? Turns out, though, this is not true.
Initial Definitions
Temperature is a number that is related to the average kinetic energy of the molecules of a substance. If temperature is measured in Kelvin degrees, then this number is directly proportional to the average kinetic energy of the molecules.
Heat is a measurement of the total energy in a substance. That total energy is made up of not only of the kinetic energies of the molecules of the substance, but total energy is also made up of the potential energies of the molecules. Temperature measure of the relative warmth or coolness of an object. Temperature is measured by means of a thermometer or other instrument having a scale calibrated in units called degrees. The size of a degree depends on the particular temperature scale being used. A temperature scale is determined by choosing two reference temperatures and dividing the temperature difference between these two points into a certain number of degrees. The two reference temperatures used for most common scales are the melting point of ice and the boiling point of water
"temperature." The Columbia Encyclopedia, Sixth Edition. 2008. Retrieved February 26, 2010 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-temperat.html
UNITS OF TEMPERATURE
Kelvin (symbol: K) is the SI unit of temperature,and is one of the seven SI base units. The Celsius temperature scale is now defined in terms of the Kelvin, with 0 °C corresponding to 273.15 Kelvins, approximately the melting point of water under ordinary conditions SI unit of temperature, and is one of the seven SI base units.The Kelvin scale and the kelvin are named after the Belfast-born physicist and engineer William Thomson, 1st Baron Kelvin (1824–1907), who wrote of the need for an "absolute thermometric scale
http://en.wikipedia.org/wiki/Kelvin
Celsius (also historically known as centigrade) is a temperature scale that is named after the Swedish astronomer Anders Celsius (1701–1744), who developed a similar temperature scale two years before his death. The degree Celsius (°C) can refer to a specific temperature on the Celsius scale as well as a unit to indicate a temperature interval (a difference between two temperatures or an uncertainty).
http://en.wikipedia.org/wiki/Celsius
Fahrenheit is the temperature scale proposed in 1724 by, and named after, the physicist Daniel Gabriel Fahrenheit (1686–1736). Today, the temperature scale has been replaced by the Celsius scale in most countries. It is still in use in the United States and a few other nations, such as Belize.
http://en.wikipedia.org/wiki/Fahrenheit
Done by:Nicole,Amanda,Mika and Alisha:)
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