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#### kylon

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##### about heat, energy and calorimeter
« on: July 04, 2007, 02:17:19 AM »
Can any expert tell me what is the meaning of "Heat Capacity" and "Specific Heat Capacity"?
What is the purpose of calibration of the calorimeter?
Why we need to stir the solution when having a experiment to calibrate the calorimeter?
thank you for all your help.

#### gtang1986

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##### Re: about heat, energy and calorimeter
« Reply #1 on: July 04, 2007, 05:06:03 AM »
Can any expert tell me what is the meaning of "Heat Capacity" and "Specific Heat Capacity"?
What is the purpose of calibration of the calorimeter?
Why we need to stir the solution when having a experiment to calibrate the calorimeter?
thank you for all your help.

1)Heat capacity (usually denoted by a capital C, often with subscripts) is a measurable physical quantity that characterizes the ability of a body to store heat as it changes in temperature. It is defined as the rate of change of temperature as heat is added to a body at the given conditions and state of the body (foremost its temperature). In the International System of Units, heat capacity is expressed in units of joules per kelvin. It is termed an "extensive quantity" because it is sensitive to the size of the object (for example, a bathtub of water has a greater heat capacity than a cup of water). Dividing heat capacity by the body's mass yields a specific heat capacity (also called more properly "mass-specific heat capacity" or more loosely "specific heat"), which is an "intensive quantity," meaning it is no longer dependent on amount of material, and is now more dependent on the type of material, as well as the physical conditions of heating.

2)We need to calibrate it first because in every instrument, it is impt to have a standard reference to start from as to ensure the accuracy and consistency of the experiment.

3) Stirring makes the solution more evenly spreaded and thus a more accurate calibration can be taken. Example, heat flow may be involved during a reaction. Heat may be concentrated in an area of fluid and diluted in other areas. Stirring thus helps to make the reaction to occur faster, complete and thus a more accurate measurement can be made.

haha..hope it helps..if it does,pls gimme a dobbiesnack..=P

#### Borek

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##### Re: about heat, energy and calorimeter
« Reply #2 on: July 04, 2007, 05:55:56 AM »
Can any expert tell me what is the meaning of "Heat Capacity" and "Specific Heat Capacity"?
What is the purpose of calibration of the calorimeter?
Why we need to stir the solution when having a experiment to calibrate the calorimeter?
thank you for all your help.