Raise Water Temperature 20kcal - How to Calculate?

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Discussion Overview

The discussion revolves around the question of how to raise the temperature of 1 liter of water by 20 kcal. Participants explore various methods and considerations related to this energy requirement, including practical approaches and theoretical understanding.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant notes that 20 kcal is a quantity of energy, not a temperature, and expresses confusion about how to apply this to heating water.
  • Another participant suggests using an immersion heater and timing how long it takes to raise the temperature of water by 1 degree Celsius, proposing to multiply this time by 20 to achieve the desired temperature increase.
  • A different participant emphasizes the challenge of quantifying heat and mentions calorimeters as a method to measure heat evolved from reactions or combustions.
  • One participant simply states to heat the water until the temperature increases by about 20 degrees Celsius, implying a direct approach without detailing the method.

Areas of Agreement / Disagreement

Participants express varying levels of understanding and approaches to the problem, with no clear consensus on the best method to achieve the temperature increase or how to interpret the energy requirement.

Contextual Notes

There are unresolved assumptions regarding the method of heating, the efficiency of the heating process, and the specific conditions under which the temperature increase is to be measured.

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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