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AllenHe
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Why does the specific heat capacity of an object changes with temperature?Please explain in detail.Thanks..
AllenHe said:thank you. but I still don't understand, because I'm still in AS level.
AllenHe said:thank you. but I still don't understand, because I'm still in AS level.
AllenHe said:Why does the specific heat capacity of an object changes with temperature?Please explain in detail.Thanks..
I think that means you pretty much understood the key thing.AllenHe said:The only thing I might have understood from your answer is that at low temperature, the atoms can't rotate or something,so heat can't be passed on.
Imagine you are draining water out of a pool. At first, the water level drops by a fixed amount for a given amount of water you take out. That's like when the heat capacity is staying constant, the T drops a fixed amount for given heat taken out. But underneath the water of the pool, there might be structure that you don't realize when you just look at the pool. For one thing, you might have a "shallow end", such that if you drain enough water out, the shallow end starts to completely drain out. Now you will find that for that same given amount of water (energy) removed, the water level (temperature) has dropped a lot more than it did in the beginning, because now it's all coming out of the "deep end" (modes that can still actively hold energy even at low T). The presence of the "shallow end" in the pool, which is responsible for this drop in heat capacity when the T drops, is due to quantum mechanics, that's what epenguin was saying.On my book, it says that when their is a small change in temperature, the specific heat capacity is almost constant. But over a wide range of temperature, it might change.Why?
Specific heat capacity is the amount of heat required to raise the temperature of one gram of a substance by one degree Celsius. It is a measure of how much a substance can store thermal energy.
Specific heat capacity is typically measured using a calorimeter, which is a device that can accurately measure the amount of heat absorbed or released by a substance. The substance is heated or cooled and the change in temperature is recorded, along with the amount of heat applied. The specific heat capacity can then be calculated using the formula Q = mcΔT, where Q is the heat applied, m is the mass of the substance, and ΔT is the change in temperature.
Specific heat capacity is directly related to temperature. As the temperature of a substance increases, its specific heat capacity decreases. This means that it takes less heat to raise the temperature of a substance at higher temperatures compared to at lower temperatures. This is because at higher temperatures, molecules are already moving faster and have more thermal energy, making it harder to increase their energy further.
The specific heat capacity of a substance is dependent on its molecular structure and composition. Different substances have different types of bonds and arrangements of atoms, which affects how they store and release thermal energy. For example, substances with strong intermolecular bonds (such as water) have higher specific heat capacities because it takes more energy to break these bonds and raise the temperature of the substance.
Specific heat capacity has many practical applications, such as in cooking, heating and cooling systems, and in the production of electricity. In cooking, specific heat capacity is important in determining the cooking time and temperature for different types of foods. In heating and cooling systems, specific heat capacity is used to calculate the amount of energy needed to heat or cool a space. In the production of electricity, specific heat capacity is used in power plants to convert thermal energy into electrical energy.