Class: BE210
Group: W1
Members: FACILITATOR
..
..Neha
Amin
TIME & TASK KEEPER
.
Emily Clark
SCRIBE
.
..Cheryl Phua
PRESENTER . .Shishir Dube
Date: May, 2001
Abstract:
Bomb Calorimetry is a useful process for determining the heat of combustion
of elements. The optimal use of a bomb calorimeter involves the digital
reading of the temperature change rather than a manual recording.
The three devices (mercury thermometer, NTC thermistor, and LM135 temperature
sensor chip) yielded temperature versus time data, which was used to
calculate the energy equivalent factor of the calorimeter (W). Nine
trials were performed at various initial temperatures to determine if a
given device was universally better or if one was more accurate at room
temperature (24.5 ºC) while the other is better at higher or lower
temps. The mean W values obtained for the mercury thermometer, chip,
and thermistor were: 2505.12±1.90%, 2464.31±1.80%, and 2729.02±11.80%,
respectively. Based on the precision of the values between trials,
accuracy of the instruments, ease of use and cost, the chip is the best
device at the range of temperatures tested in the experiment (20 to 29
ºC).