Problem

$\bullet$$\bullet$ The atmosphere of the planet M…

02:50

Problem 16 Medium Difficulty

$\bullet$$\bullet$ Solid water (ice) is slowly warmed from a very low temperature. (a) What minimum external pressure $p_{1}$ must be applied to the solid if a melting phase transition is to be observed? Describe the sequence of phase transitions that occur if the applied pressure $p$ is such that $p < p_{1}$ . (b) Above a certain maximum pressure $p_{2},$ no boiling transition is observed. What is this pressure? Describe the sequence of phase transitions that occur if $p_{1} < p < p_{2}$

Answer

$\mathbf{a}-610 \mathrm{Pa}$ and sublimation is occur if $p<p_{1}$
$\mathrm{b}-221.2 \times 10^{5} \mathrm{Pa}$ and a transition from solid to liquid occur then second
transition from liquid to vapour if $p_{1}<p<p_{2}$

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Physics 101 Mechanics

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Video Transcript

this. Chapter 15. Problem number 16. We have ice slowly warmed up in part, gave were asked what minimum IQ? Strong pressure P one must be applied. Minimum external pressure. P one must be applied for melting, please Transition to be observed. And in the second part of the problem, still part ay. He wants us to describe a sequence of these transitions that occur if he applied. Pressure he applied is less than this people. So before addressing the answer directly, let's remember fae Viagra, right. So we have pressure versus temperature and then we have the region where we where we have while isis basically. And then we reached a triple point. Right. Careful point in this particular point, and then depending on whether or not we want, have guests or the liquid form. Right. So until we hit the grateful point here, then, as you can see clearly from a phase there, Graham, for the mounting phase transition to happen, at least we need to be if this triple point, right? So eso let's say to observe melting the pressure must be the pressure. Must be a policed. Um, he cool Teo, uh, trip for point pressure which is 610 castles. Right. So now let's address the second heart of the question. Um, Then we bled to describe a sequence of these transitions that occur if he applied. Pressure is actually less than triple point. Um, pressure. Then Then Then what we would have is that basically we have from solid to gas transition, right solid to a vapor. So for pee less dump you want, what we have is solid to paper. Um, transition right, which we call also sublimation. All right, now, part me above a certain pressure p to know boiling transition is observed. What is this? Pressure described the sequence of these transitions that occur. So I just wanted a time. Right. So if no boiling So from liquid to gas transition shift from liquid to gas transitions of observed, then he too has to be greater. Then the critical point pressure right has to be creator. Then then the critical point, then critical point pressure. Um, well, which is is, you know, he, um people point pressure is two point tio two tents and two for seven passports. Right? This is critical. I want. So if there's no boiling then a Pete who has to be greater than a critical point. Pressure now on the second part of the question, describe the sequence of pace transitions that occur if he won is less than peak. And that is less than he, too. Well, then, going back to the diagram on the first page. If P one is less than P, and that is less than P two thing you see first solid to liquid and then liquid to wait for right. So, first, if this were the case, first be observed solid to liquid melting right second from liquid to to second from liquid to paper.

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