thermodynamics
DESCRIPTION
Thermodynamics. If there was a thermometer attached to the rubber band, what would you observe?. Thermodynamics. If there was a thermometer attached to the rubber band, what would you observe? The temperature goes up. Thermodynamics. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Thermodynamics](https://reader030.vdocuments.mx/reader030/viewer/2022032708/56812b99550346895d8fbbb5/html5/thumbnails/1.jpg)
1
Thermodynamics
If there was a thermometer attached to the rubber band, what would you observe?
![Page 2: Thermodynamics](https://reader030.vdocuments.mx/reader030/viewer/2022032708/56812b99550346895d8fbbb5/html5/thumbnails/2.jpg)
2
Thermodynamics
If there was a thermometer attached to the rubber band, what would you observe?
The temperature goes up
![Page 3: Thermodynamics](https://reader030.vdocuments.mx/reader030/viewer/2022032708/56812b99550346895d8fbbb5/html5/thumbnails/3.jpg)
3
Thermodynamics
If there was a thermometer attached to the rubber band, what would you observe?
The temperature goes up
∆Q α ∆T
∆Q is the heat involved
![Page 4: Thermodynamics](https://reader030.vdocuments.mx/reader030/viewer/2022032708/56812b99550346895d8fbbb5/html5/thumbnails/4.jpg)
Part 2, A: THERMODYNAMICS
HEAT
27
Units
The unit on heat should be Joules, but oftenpeople use the calorie, or kilocalorie.
1 kcal = amount of heat required to raise 1 kg of water by 1 degree Celcius.
1 kilocal = 4.2 kilojoules4
![Page 5: Thermodynamics](https://reader030.vdocuments.mx/reader030/viewer/2022032708/56812b99550346895d8fbbb5/html5/thumbnails/5.jpg)
5
Thermodynamics
Heat
∆Q α ∆T
![Page 6: Thermodynamics](https://reader030.vdocuments.mx/reader030/viewer/2022032708/56812b99550346895d8fbbb5/html5/thumbnails/6.jpg)
6
Thermodynamics
Heat
∆Q α ∆T
![Page 7: Thermodynamics](https://reader030.vdocuments.mx/reader030/viewer/2022032708/56812b99550346895d8fbbb5/html5/thumbnails/7.jpg)
7
Thermodynamics
Heat
∆Q α ∆T or ∆Q = (slope) m ∆T
∆Q
m∆T
![Page 8: Thermodynamics](https://reader030.vdocuments.mx/reader030/viewer/2022032708/56812b99550346895d8fbbb5/html5/thumbnails/8.jpg)
8
Thermodynamics
Heat
∆Q α ∆T or ∆Q = (slope) m ∆T
NOTE: Equal masses
Iron
Water
m∆T
∆Q
![Page 9: Thermodynamics](https://reader030.vdocuments.mx/reader030/viewer/2022032708/56812b99550346895d8fbbb5/html5/thumbnails/9.jpg)
Part 2, A: THERMODYNAMICS
HEAT
29
4.2 kJ = amount of heat required to raise 1 kg of water by 1 degree Celcius.
Therefore, for water the slope is
4.2kJ
kg- Co9
![Page 10: Thermodynamics](https://reader030.vdocuments.mx/reader030/viewer/2022032708/56812b99550346895d8fbbb5/html5/thumbnails/10.jpg)
10
Thermodynamics
Heat
∆Q = (slope) m ∆T
The slope of this graph is called the specific heat capacity. For
water, the specific heat capacity is
4.2 kj/kg-oC
![Page 11: Thermodynamics](https://reader030.vdocuments.mx/reader030/viewer/2022032708/56812b99550346895d8fbbb5/html5/thumbnails/11.jpg)
11
Thermodynamics
Heat
∆Q = (4.2 kj/kg-oC ) m ∆T
How much heat is required to raise the temperature of 10 kg of water by 20 oC?
![Page 12: Thermodynamics](https://reader030.vdocuments.mx/reader030/viewer/2022032708/56812b99550346895d8fbbb5/html5/thumbnails/12.jpg)
12
Thermodynamics
Heat
∆Q = (4.2 kj/kg-oC ) m ∆T
How much heat is required to raise the temperature of 10 kg of water by 20 oC?
Heat = (4.2 kj/kg-oC ) (10 kg) (20 oC)= 840 kj
![Page 13: Thermodynamics](https://reader030.vdocuments.mx/reader030/viewer/2022032708/56812b99550346895d8fbbb5/html5/thumbnails/13.jpg)
13
Thermodynamics
Heat
∆Q = (slope) m ∆T
NOTE: Equal masses
Clay, Marble
Water∆Q
m∆T
![Page 14: Thermodynamics](https://reader030.vdocuments.mx/reader030/viewer/2022032708/56812b99550346895d8fbbb5/html5/thumbnails/14.jpg)
Part 2, A: THERMODYNAMICS
HEAT
31
Question: Water has a high specific heatcapacity. When heat is added or removedfrom water, will this produce a relativelylarge or small change in temperature forthe water as compared to, for example,clay?
14
![Page 15: Thermodynamics](https://reader030.vdocuments.mx/reader030/viewer/2022032708/56812b99550346895d8fbbb5/html5/thumbnails/15.jpg)
15
Thermodynamics
Heat
∆Q = (slope) m ∆T
NOTE: Equal masses
Clay, Marble
Water∆Q
m∆T
![Page 16: Thermodynamics](https://reader030.vdocuments.mx/reader030/viewer/2022032708/56812b99550346895d8fbbb5/html5/thumbnails/16.jpg)
16
Thermodynamics
Heat
∆Q = (slope) m ∆T
NOTE: Equal masses
Clay, Marble
Water∆Q
m∆T
![Page 17: Thermodynamics](https://reader030.vdocuments.mx/reader030/viewer/2022032708/56812b99550346895d8fbbb5/html5/thumbnails/17.jpg)
17
Thermodynamics
Heat
∆Q = (slope) m ∆T
NOTE: Equal masses
Clay, Marble
Water∆Q
m∆T
![Page 18: Thermodynamics](https://reader030.vdocuments.mx/reader030/viewer/2022032708/56812b99550346895d8fbbb5/html5/thumbnails/18.jpg)
18
Thermodynamics
Heat
∆Q = (slope) m ∆T
NOTE: Equal masses
Clay, Marble
Water∆Q
m∆TSmall change Large change
![Page 19: Thermodynamics](https://reader030.vdocuments.mx/reader030/viewer/2022032708/56812b99550346895d8fbbb5/html5/thumbnails/19.jpg)
Part 2, A: THERMODYNAMICS 31
19
![Page 20: Thermodynamics](https://reader030.vdocuments.mx/reader030/viewer/2022032708/56812b99550346895d8fbbb5/html5/thumbnails/20.jpg)
20
Thermodynamics
Heat
∆Q = (slope) m ∆T
The variation in temperature between day and night on mars can be as much as 150 degree Fahrenheit, while the variation in temperature on the earth is far smaller. Why?
![Page 21: Thermodynamics](https://reader030.vdocuments.mx/reader030/viewer/2022032708/56812b99550346895d8fbbb5/html5/thumbnails/21.jpg)
Part 2, A: THERMODYNAMICS 31
21