water heating with a gas burner
Material:
- gas burner (propane and butane)
- 1l water
- Termometer
- Clock
We have the mass of the gas burner determined using a beam balance. The burner 347.54 g.
weighed Then we heated the water (room temperature 22.5 ° C) while we measured the Wassertempeatur minute. 
this case, the following values:
We nine of the water for several minutes (up to the bar in the table) and then heated for 2min long observed that the water is further heated or decreases as ours has been the case.
We then weighed the torch one more time, this time he weighed 341.65 g. This gives a mass difference of 5.89 g results and a difference in water temperature of 62 ° C.
Now we calculate the object, the heat capacity of water. The following values \u200b\u200bwere given:
- calorific value of propane and butane
- mass of burned Propan/Butan-Gemischs (5,89 g)
- Masse des Wassers (1000 g)
- Temperaturdifferenz in K des Wassers (62 K)
- die Formel der Wärmekapazität: Wärmeenergie/Masse x Temperaturdifferenz in K
- und die Formel der Wärmeenergie: Brennwert x Masse des verbrannten Stoffes/Masse des erwärmten Stoffe
= 0,293911mJ
Wärmekapazität von Wasser= 0,293911 mJ/1000g x 62 K
= 11,85125 J/g x K
Der Value of the heat capacity of water in the literature is 4.183 J / gx K
This suggests the close much of the heat of the torch has been lost to the environment. Small measurement error could also be present. These two criteria could be responsible for the incorrect value.
suggestions:
- accurate measuring instruments
- isolation of burner to the water vessel and the water vessel itself
- heat the water from the "inside" for instance by Heitz rod.
