Raise Water Temperature 20kcal - How to Calculate?

AI Thread Summary
To raise the temperature of 1 liter of water by 20 kcal, one must understand that kcal is a measure of energy, not temperature. The energy required to increase the temperature of water can be calculated using the specific heat capacity, which states that 1 kcal raises 1 kg of water by 1°C. An immersion heater can be used to heat the water, and the time taken to raise the temperature by 1°C can be measured to determine the total time needed for a 20°C increase. Additionally, calorimeters can be utilized to calculate the heat evolved from a reaction or combustion to achieve the desired temperature increase. Understanding these concepts is crucial for accurately raising the temperature of water by a specific energy amount.
gnome222
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Suppose there is beaker filled with 1L of water.
EDIT: You want to raise the temperature of this beaker by 20kcal. The thing that I don't understand is how would you go about doing so. Like one cal is energy required to raise one gram of water by one celsius. But what would you use to raise the temperature ad how would you convert that you energy (like what if you use fire or something like that)
 
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gnome222 said:
Suppose there is beaker filled with 1L of water. You want to raise the temperature of this beaker by 20kcal. The thing that I don't understand is how would you go about doing so. My thigh is that you would take immersion heater and take a separate beaker as your test beaker with 1L of water and put the immersion beaker in it and time how long would it take to raise the temperature of that beaker by 1 degree of Celsius, which would be one kcal. So to raise the temperature to 20kcal you would multiply the 20 by the time it takes to raise it by one kcal. Is this approach correct? Thanks

20 kcal is not a temperature, it is a quantity of energy. Then you start talking about the time it takes to raise the temperature of water 1 degree. It's not clear what you are asking.
 
SteamKing said:
20 kcal is not a temperature, it is a quantity of energy. Then you start talking about the time it takes to raise the temperature of water 1 degree. It's not clear what you are asking.
Well, ok so you have one liter of water and you want to raise it by 20 kcal. The thing is that i don't know how would you go about doing that.
 
Well, it's difficult to grab a bag containing a certain amount of heat and stuff it into a container of water.

There are certain calorimeters where a known quantity of a substance is reacted or combusted so that the total amount of heat evolved can be calculated. The change in temperature of the water can then be measured.

For more info, see this article:

http://en.wikipedia.org/wiki/Calorimeter
 
gnome222 said:
Well, ok so you have one liter of water and you want to raise it by 20 kcal. The thing is that i don't know how would you go about doing that.
Heat it up until the temperature increases by about 20 degrees
 

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