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What is latent heat, and what is sensible heat?

2021-05-17View Original

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What is latent heat, and what is sensible heat?
Reply #22021-05-17
When an object absorbs (or releases) heat, it only increases (or decreases) the thermal kinetic energy of its molecules, that is, it only raises (or lowers) the object’s temperature without changing its state, and the heat absorbed (or released) by such an object is called sensible heat. Conversely, when an object absorbs (or releases) heat that only increases (or decreases) the thermal potential energy of its molecular particles, the heat absorbed (or released) by the object is called latent heat.
Reply #32021-05-17
What was said upstairs is quite good; it’s professional enough. It’s just not easy to understand and remember, and it’s awkward to pronounce. Let me explain it in a different way. Sensible heat is the heat absorbed or released by a substance without undergoing a phase change ; Latent heat is the heat absorbed or released by a substance during a phase change. The heat that needs to be absorbed for water (at 100°C) to evaporate into water vapor (at 100°C) is the latent heat. The heat that needs to be absorbed for water at 99℃ to turn into water at 100℃ is known as sensible heat. The heat that needs to be released when steam at 101℃ turns into steam at 100℃ is this kind of heat, which is known as sensible heat.
Reply #42021-05-18
Your explanation is easier to understand; P
Reply #52021-05-31
What was said on the second floor was easy to understand; I learned it
Reply #62021-06-03
That's a good question. Amorphous materials have latent heat. Its most prominent feature is that its melting point is not fixed; it is generally expressed as a range. In the heat storage industry, paraffin wax, which is commonly used, is amorphous; its latent heat capacity is utilized, as this high latent heat allows for a reduction in the volume of the container as well as the ability to change its shape at will. The latent heat of phase change is approximately 100–300 kJ/kg, which is much higher than the latent heat of water at 4.2 kJ/kg; as a result, less land area is required for heat storage compared to water. In simple terms, wherever there is a melting phase transition, there is latent heat. Because melting is a process that cannot be completed instantly, latent heat is present throughout this period. Of course, perhaps my exposure has been limited and my knowledge base is insufficient, so there might be special cases; I also hope for corrections and discussions on this matter.

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