TEMPERATURE
What exactly is Temperature?
Temperature is the measurement of how hot or cold something is. Our bodies can feel the difference between something which is hot and something which is cold.
> Temperature plays an important role in almost all fields of science, including physics, geology, chemistry, and biology.
> Temperature is also used to measure the weather of our surroundings and our body heat. For example, when someone has a fever, we say that they have a temperature of 37.6 degrees celsius.
___________________________________
UNITS OF TEMPERATURE
1. Temperature can be measured with many different units, the most common being:
a) Degrees Celsius (Symbol: ' º ')
b) Centigrade (Symbol: C)
c) Farenheit (Symbol: F) &
d) kelvin (Symbol: K), which is the S.I Unit for Temperature.
DEGREES CELSIUS
- Degrees celsius is most commonly used for measuring body temperature, which normally ranges from 36º - 42º.
CENTIGRADE & FARENHEIT
- Centigrade and Farenheit are normally used when cooking or baking, and is used to set the temperature of an oven or a stove.
Eg. Mary set the oven to 180 C/ 350 F to bake a cake.
KELVIN
-The kelvin is the SI unit of temperature. It is named in honour of the physicist William Thomson, the first Lord Kelvin (1824–1907). The Kelvin scale is defined by a specific relationship between the pressure of a gas and the temperature. This means that "kelvin" is an absolute temperature scale, and is used by scientist more than any other unit of measurement in terms of temperature.
William Thomson [Lord Kelvin]
Credits: Information & Picture on "Kelvin" adapted from http://simple.wikipedia.org/wiki/Kelvin
__________________________________________________________________
TOOLS USED IN TEMEPERATURE
Thermometers
Liquid-in-glass thermometers measure temperatures in degrees Fahrenheit (°F) or degrees Celsius (°C). They are made of sealed glass and contain a fluid, usually mercury or red alcohol. It can read a range of temperatures from -10°C to 110°C.
Bimetallic strip thermometers include two different metals that are joined together and expand at different rates as they warm up.
Thermistors measure changes in electrical resistance and convert them to changes in temperature. It can read a range of temperatures from -90 °C to 130 °C.
Infrared thermometers are non-contact devices that convert infrared (IR) energy to an electrical signal that can be displayed in units of temperature.
Liquid-in-glass thermometers measure temperatures in degrees Fahrenheit (°F) or degrees Celsius (°C). They are made of sealed glass and contain a fluid, usually mercury or red alcohol. It can read a range of temperatures from -10°C to 110°C.
Bimetallic strip thermometers include two different metals that are joined together and expand at different rates as they warm up.
Thermistors measure changes in electrical resistance and convert them to changes in temperature. It can read a range of temperatures from -90 °C to 130 °C.
Infrared thermometers are non-contact devices that convert infrared (IR) energy to an electrical signal that can be displayed in units of temperature.
Thermocouples are a widely used type of temperature sensor for measurement and can also be used to convert heat into electric power. They are interchangeable and can measure a wide range of temperatures.
__________________________________________
HEAT AND TEMPERATURE
Heat & Temperature:
Who thinks that Heat and Temperature are the same thing?
If you are one of these people, you're wrong.
The concepts of Heat and Temperature are thought to be the same thing, but they are not.
Perhaps it's because as human beings on Earth, everyday experience leads us to notice that when you heat something up, say making a fire while camping, then the temperature of that something goes up. More Heat, More Temperature - they must be the same right? Unfortunately, the answer is no.
Temperature is a number that is related to the average kinetic energy of a molecuses of a substance.
Heat is the measurement of a total energy in a substance.
So, Temperature is not energy. If you measure it in Kelvin, then the temperature value is directly proportional to the average kinetic energy of the molecuses in the substance.
Heat is the total amountof energy possesed by the molecuses in a piece of matter. This energy is both kinetic and potential energy.
For an example:
2 things may have the same amount of heat, but they may not have the same temperature.
2 things may have the same temperature, but they may not have the same amount of heat.
Why, you may ask.
Given some temperature, there is more heat in a larger mass/volume of water compared to a smaller one.
Information fromhttp://id.mind.net/~zona/mstm/physics/mechanics/energy/heatAndTemperature/heatAndTemperature
Who thinks that Heat and Temperature are the same thing?
If you are one of these people, you're wrong.
The concepts of Heat and Temperature are thought to be the same thing, but they are not.
Perhaps it's because as human beings on Earth, everyday experience leads us to notice that when you heat something up, say making a fire while camping, then the temperature of that something goes up. More Heat, More Temperature - they must be the same right? Unfortunately, the answer is no.
Temperature is a number that is related to the average kinetic energy of a molecuses of a substance.
Heat is the measurement of a total energy in a substance.
So, Temperature is not energy. If you measure it in Kelvin, then the temperature value is directly proportional to the average kinetic energy of the molecuses in the substance.
Heat is the total amountof energy possesed by the molecuses in a piece of matter. This energy is both kinetic and potential energy.
For an example:
2 things may have the same amount of heat, but they may not have the same temperature.
2 things may have the same temperature, but they may not have the same amount of heat.
Why, you may ask.
Given some temperature, there is more heat in a larger mass/volume of water compared to a smaller one.
Information fromhttp://id.mind.net/~zona/mstm/physics/mechanics/energy/heatAndTemperature/heatAndTemperature
_______________________________________
TEMPERATURE USED IN DAY TO DAY LIFE
Temperature is used in everyday life,for example,simple things like the weather reports,cooking or even getting warm by a fire or cooling down in a pool.All of those examples have something to da with temperature!
Weather reaports use temperature to tell us about the days weather,ofcourse,whether the day will be hot or cold.We listen to the weather reports every morning to find out the weather for the day.If we did not know about the weather we could end up wearing a winter suit on a hot summers day.
Cooking provides us humans with necessary food everyday.To cook food we need a source of heat.A source of heat, for example ,a campfire,a stove or even an oven.Heat is directly linked to heat and without heat there will be no food.So, in other word,without temperature the will be no heat for us t ocook and consume our food.
Cooling down or warming up is also directly related to temperature.Which is what enables us to warm up or cool down.
Temperature is used in everyday life,for example,simple things like the weather reports,cooking or even getting warm by a fire or cooling down in a pool.All of those examples have something to da with temperature!
Weather reaports use temperature to tell us about the days weather,ofcourse,whether the day will be hot or cold.We listen to the weather reports every morning to find out the weather for the day.If we did not know about the weather we could end up wearing a winter suit on a hot summers day.
Cooking provides us humans with necessary food everyday.To cook food we need a source of heat.A source of heat, for example ,a campfire,a stove or even an oven.Heat is directly linked to heat and without heat there will be no food.So, in other word,without temperature the will be no heat for us t ocook and consume our food.
Cooling down or warming up is also directly related to temperature.Which is what enables us to warm up or cool down.
-END-
-Sasha, Julia, Kaiwen and Rachel Ho
No comments:
Post a Comment