Horace Heffner wrote:
In earlier reports I expressed concern about the calorimetry
employed by Kitamura et al. The flow rate of the cooling fluid is 6
ml per minute.
I wonder if there is a typo, i.e. it should be 6 ml/s.
Nope. Definitely 6 ml/min. 360 ml/min would be far too much.
It is notable that such a slow a flow rate of 6 cm^3/min or 0.1 g/s
would limit the calorimeter to a maximum of
(4.186 joule/gram °C)* (0.1 g/s)*(70 °C) = 29 W
total, assuming an input temperature of 30 ° C,
and that would be pushing the calorimeter fluid to boiling, which
can cause errors.
It is nowhere near that limit. I think the
maximum output has lately been around ~2 W, I
think. It was more like 0.2 W before.
The heat added to the water by the stirrer is
apparently too small to measure. I do not know what kind of stirrer it is.
- Jed
