When do you use both the equations? i believe one c is specific heat, and the other is heat capacity? can someone please explain these for me? thanks!
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The Q = CΔT is used when calculating heats using a Bomb calorimeter.
The other is used when you are just heating something in open air.
C is the "heat capacity" of the calorimeter
c is the specific heat capacity of the something you are heating
The other is used when you are just heating something in open air.
C is the "heat capacity" of the calorimeter
c is the specific heat capacity of the something you are heating
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Why do you burn your tongue on the filling and not the crust when you bite into your favorite hot pie? The mystery is solved by examining heat capacity.
To cut down on cleaning time, I like to line my baking utensils with aluminum foil. When I use an aluminum cake pan, say to heat food, I notice that the liner is much cooler than the pan after I remove them from the oven. However, the heat from my iron or glass baking ware is such that I can feel it emanating even when I use the knitted oven mitt my daughter gave to me when she was in grade school. I am much more careful to avoid accidentally touching them when I transfer food, and I allow a much greater cooling interval to elapse before I attempt to clean them. The differences in temperature concerning the heating and cooling of my baking utensils is attributed to their heat capacity.
The transfer of heat to or from an object is related to its temperature. This relationship is specified by a direct proportionality constant C, called the heat capacity, and the equation is:
(1) Q = CΔT
with Q representing heat and ΔT the temperature change. C is measured in energy per degree or energy per kelvin. For example, if Q is in joules and temperature is in Kelvin, C is J/K. Equally valid units are cal/oC or cal/K or Btu/oF, and we can see this relationship more easily by solving directly for C:
Read more: http://www.brighthub.com/engineering/mec…
To cut down on cleaning time, I like to line my baking utensils with aluminum foil. When I use an aluminum cake pan, say to heat food, I notice that the liner is much cooler than the pan after I remove them from the oven. However, the heat from my iron or glass baking ware is such that I can feel it emanating even when I use the knitted oven mitt my daughter gave to me when she was in grade school. I am much more careful to avoid accidentally touching them when I transfer food, and I allow a much greater cooling interval to elapse before I attempt to clean them. The differences in temperature concerning the heating and cooling of my baking utensils is attributed to their heat capacity.
The transfer of heat to or from an object is related to its temperature. This relationship is specified by a direct proportionality constant C, called the heat capacity, and the equation is:
(1) Q = CΔT
with Q representing heat and ΔT the temperature change. C is measured in energy per degree or energy per kelvin. For example, if Q is in joules and temperature is in Kelvin, C is J/K. Equally valid units are cal/oC or cal/K or Btu/oF, and we can see this relationship more easily by solving directly for C:
Read more: http://www.brighthub.com/engineering/mec…