2k views

### Why do heating curves have plateaus? [duplicate]

The heating curve of a solid looks something like this: Why do the plateaus occur, various explanations online say that it is because the energy is being used to break the bonds(why is not bond ...
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485 views

### Why in open container and atmospheric pressure the temperature of water can't be increased more than 373K? [duplicate]

I am a high school student and I am very confused in understanding the phase diagram and boiling. It seems like most people didn't understood the question well may be because I didn't explain the ...
1 vote
387 views

### At freezing/condensation point, why does the temperature remain constant? [duplicate]

I understand that at freezing and condensation points, potential energy of molecules are given off to form intermolecular bonds while the kinetic energy of the molecule stays constant. My question is, ...
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69 views

### Why does temperature increase like this? [duplicate]

My book makes the following claim: Suppose you drop a bunch of large and small ice cubes of temperature $0$ degrees in a beaker of water, then you start heating the beaker, the temperature of the ...
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4k views

### Why is there a maximum humidity?

Recently I've been browsing humidifiers for my room. Everyone "knows" that humidity is measured in percentages, and 100% humidity is the maximum humidity that the air "can hold" - ...
3k views

### Is there a clear boundary between states of matter?

Many physical properties of different substances, like melting and boiling points, are known already. They have discrete values at standard pressure (e.g., the boiling point of helium is at 4 K). The ...
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3k views

### If boiling of water involves change in internal energy, then why does the temperature remain constant?

According to the first law of thermodynamics, $$\Delta Q=\Delta W+\Delta U$$ Considering boiling of water to be an isothermal process, $\Delta U$ should be zero, but then my textbook says: "we ...
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3k views

### Why are thermodynamic potentials minimised?

Why is it that, at equilibrium, certain potentials are minimised? That is, for a system at constant temperature and pressure, the Gibbs free energy is minimised, and for fixed volume and temperature, ...
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1 vote
371 views

### How does boiling work?

Let's assume that the exact boiling point of water is 100 degrees. Now I have a stovetop and a pot. I add the water to the pot, put it on the stovetop and turn the temperature to exactly 100 degrees. ...
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208 views

### Why condensation nuclei is required for condensation and formation of clouds?

Why condensation nuclei is required for condensation and formation of clouds? What is the physics behind it? Can you please explain it intuitively? Thank you.
1 vote
418 views

### Why does bubble formation only happens at the point when vapor pressure becomes equal to atmospheric pressure during boiling?

I am a high school student and I am very confused about what's actually happening at the microscopic scale in an ideal solution when it's boiling? Boiling as I understand at microscopic level is- ...
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187 views

### Why does it take energy to grow the surface of a drop?

Classical nucleation theory predicts that the growth of small nuclei is thermodynamically disfavoured, on account of the energy required to grow its surface. I am struggling to understand why it takes ...
71 views

### For a liquid at boiling point, how can it require a set amount of heat (latent heat) to vaporize

I've always had a hard time wrapping my head around the 2 below statements being true for vaporizing a liquid into a gas: When a liquid reaches its boiling point the temperature stops rising (and any ...
62 views

### Can latent heat exist when both phases cannot exist at same temperature?

This is my understanding (please tell me if i am going wrong anywhere): During phase change (i.e. ice melting into water) the molecules absorb heat, gain more random kinetic energy, and spread apart (...
1 vote