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"Specific Heat Capacity" Content Energy PPT Courseware 3
1. Specific heat capacity
1. Explore the ability of matter to absorb heat
think about it
Why do sand and seawater rise in temperature differently under the same sunlight conditions? Is it because sand and water are different substances?
Do it
Compare it with different substances!
See if different types of substances absorb heat in the same way.
Experiment preparation
(1) Compared to what? Who to compare with? How to compare?
(2) How to know which substance absorbs more heat?
(3) What data should be recorded?
Experimental results
When water and cooking oil of equal mass are raised to the same temperature, water requires a longer heating time, and water absorbs more heat than cooking oil.
It can be seen from this experiment that the difference in heat absorption between water and cooking oil is determined by their types.
2. What is specific heat capacity
After scientific measurements, it was found that in general, different substances absorb different amounts of heat when their masses are equal and their temperature rises the same. This property of matter is represented by the physical quantity specific heat capacity.
The ratio of the heat absorbed by a certain mass of a substance when its temperature rises to the product of its mass and the rising temperature is called the specific heat capacity of the substance.
The specific heat capacity is represented by the symbol c, its unit is joules per kilogram of degrees Celsius, and the symbol is J/(kg · ℃).
Understand specific heat capacity
The specific heat capacity of water is: c water = 4.2×103 J/(kg · ℃)
The specific heat capacity of salad oil is: c oil = 1.97×103 J/(kg·℃)
Try to tell the physical meaning of the specific heat capacity of water:
The heat absorbed or released when the temperature of 1 kg of water increases or decreases by 1°C is 4.2×103 J.
2. Calculation of heat
Knowing that the specific heat capacity of water is 4.2×103 J/(kg · ℃), can you calculate the amount of heat that 0.4 kg of water needs to absorb when its temperature rises from 20 ℃ to 70 ℃ based on its physical meaning?
heat absorbed
=4.2×103 J/(kg·℃)×0.4 kg×(70 ℃-20 ℃)
=8.4×104 J
Heat absorbed = specific heat capacity × mass × increased temperature
Q suction = cm(t1-t0) Q release = cm(t0-t1)
practice
1. Regarding specific heat capacity, which of the following statements is correct ( )
A. The higher the temperature, the greater the specific heat capacity
B． The more heat a substance releases, the greater its specific heat capacity
C. The greater the mass of a substance, the smaller its specific heat capacity
D. The specific heat capacity of a substance is independent of mass and temperature
2. Among the following four phenomena, the one that has a great relationship with the specific heat capacity of water is ( )
A. Car engines are cooled by circulating water
B． Hot water is often used for heating in daily life
C. Sprinkling water to cool down in summer
D. The temperature difference in tidal flats and wetlands is small
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