In Class Activity
We solved
for TF in terms of
TC and found the relationship to be that of which
is shown above. We used the points (0°C, 32°F) and (100°C, 212°F) to find
the above equation.
Thermal Conductivity of a Coke Can
In class we
set up an experiment using a 222mL Coke Zero can, two temperature probes, 100mL
of 23.2°C water, and 50mL of 59.5°C water. We placed the 100mL of warm water inside the can
and submerged it inside a Styrofoam cup that held the 200mL
room temperature water. We then took data of the heat transfer by placing
the temperature probes on the inside and outside wall of the can. The data
recorded was as follows:
We then
determined all the necessary measurements to calculate thermal conductivity and
got the resulting answer.
The
uncertainty of the value for thermal conductivity was calculated using...
Immersion Heaters
Our
next experiment was used to determine the specific heat capacity of water using
a 292.8 Watt immersion heater and 200mL of room temperature water.
Following the instruction we submerged the immersion heater inside the water
and recorded the temperature changed over time (20 secs).
We then inverted the graph so that it read Heat vs Temperature rather than Temperature vs Time and got the following linear graph.
The slope of this graph which was 0.8372 turns out to
actually be the heat capacity for water in J/°C.
This value makes sense because it is near the true 1.00 J/°C heat capacity for
water.
