Date post: | 15-Aug-2015 |
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Engineering |
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AssalamuAlaiku
m
Name: Syed Ahmed Khizar
Teacher: Sir Asif ImranCourse: TXCH-101Topic:
Presentation
Measurement Of Thermal Changes
Measurement Of Thermal Changes
Heat“Energy in Transit.”
“E” which trasfers from one body to another due to temperature difference.
Measurement Of Thermal Changes
Calorimetry
Calorie = Heat = Therm
Law Of Heat ExchangeAmount Of Heat
ReleasedAmount Of Heat
Absorbed=
Qreleased =
Qabsorbed
Q = mc△T
Q = nc△T
Q = c△T
Specific Heat
Molar Heat Capacity
Molar Heat Capacity
Heat Released or Absorbed By A Body:
Problem
For every process:
Every substance have d/f value of “c”.
Impossible for unknown substance.
ChemicalOr
Physical
Heat changes occur
Easy Solution
Do the process in water.
Why?Process Water
Qprocess = Qwater
But still
error
Another Problem
Environment
Solution
Open System M E
Close System M E
Isolated System M E
System
Calorimeter
Not a measuring instrument.Used to keep heat inside.
Container also absorb heat.
Another Problem
Qprocess = Qwater +
Qcontainer
Qprocess = Qwater +
Qcontainer
Qprocess = mwcw△T +
mccc△T
How to take reading?
1)Mc
2)Mw
3)Ti
4)Tf
Qprocess = mwcw(Tf-Ti) + mccc(Tf-Ti)
ReadingsBalance
Thermometer