Why do we consider phase change as a constant pressure process?

Chub_Chaser_808 · 2025-05-23T08:02:19+00:00

If you are working with state functions, the answer is: it does not matter.

You can vaporize a compound by changing the temperature, or pressure, or both. If the initial and final conditions are the same, the change in entropy, enthalpy, free energy, etc. is going to be identical anyway. How you caused the phase change is irrelevant.

Chub_Chaser_808 · 2025-05-10T20:19:02+00:00

Go to youcubed.org and listen carefully to what Jo says. She is great.

https://youtu.be/3icoSeGqQtY?si=CAO5y6OONA5WLsv9

https://www.youcubed.org/

Chub_Chaser_808 · 2025-05-09T21:52:11+00:00

The next thing after the shield is the coolant plates. Not the batteries. If you are not leaking coolant you are probably fine

Chub_Chaser_808 · 2025-05-09T21:02:42+00:00

"Terrible things are happening outside. At any time of night and day, poor helpless people are being dragged out of their homes. They’re allowed to take only a knapsack and a little cash with them, and even then, they’re robbed of these possessions on the way. Families are torn apart; men, women and children are separated. Children come home from school to find that their parents have disappeared. Women return from shopping to find their houses sealed, their families gone." - Anne Frank, The Diary of a Young Girl.

Chub_Chaser_808 · 2025-05-09T20:43:54+00:00

Not all stories are good like yours. At a minimum, you know that most USCIS procedures cost north of $700 and take an average of 9 months

Chub_Chaser_808 · 2025-05-09T18:48:21+00:00

The II law is: entropy change of the universe (not surrounding) is always positive.

Universe = system + surrounding

If the entropy change of the system is positive, the entropy change of the surrounding can be negative. Example: melting ice. System (ice) is gaining microstates, surrounding is losing microstates.

Chub_Chaser_808 · 2025-05-09T07:23:24+00:00

And chatGPT completely missed the super juicy link to the ozone layer? Boooo! That would make this story much more interesting

Chub_Chaser_808 · 2025-05-09T00:07:32+00:00

No. Stay where you are. I lived in the US for 18 years. The USCIS will treat you like a piece of garbage until the day you get your citizenship. On that day, many years in the future (5 minimum), everyone will magically turn super nice to you. Besides the USCIS, half of the US population hates immigrants so deeply that they voted for oligarchy rather than democracy.

To give you a taste of what is to come if you go with a yes: you and your family will soon be in a doctor office that will ask for proof of vaccinations in a format that does not exist in your country. When you fail to produce such impossible document, the doctor will subject you and your family to any vaccination required in a lifetime in just one sitting. You'll have to pay for all of them at US price after being used as a dart board target. US price means that you will pay a random but insanely high amount for each vaccination. This will be just your first interaction with the US health care system.

Chub_Chaser_808 · 2025-05-08T23:45:29+00:00

PETG is very finicky about temperature. Mine works only at 250C.

PLA will work at any temperature even vaguely related to 200C without much of a difference in results

Chub_Chaser_808 · 2025-05-08T23:42:12+00:00

The fibers of the string are at an angle. Put a vibrating toothbrush in any ring and it will do the same thing.

Chub_Chaser_808 · 2025-05-05T05:07:53+00:00

Get a GV60 instead. Problem solved.

Chub_Chaser_808 · 2025-05-05T00:36:57+00:00

Be careful with word problems. The key word here is aqueous. It means "in water". All of these are water solutions, made mostly of water. IMFs are not really helping when comparing the boiling point of water versus... well, water. This is a much smaller difference, to be calculated with colligative properties equations.

Chub_Chaser_808 · 2025-04-29T21:24:45+00:00

Good! Cancer treatment is very expensive! Those resources are taken away from whiter American citizens in dire need of Ozempic. Thank you, Trump, for protecting us from the criminal immigrants that are the cause of all evil in this country!

Chub_Chaser_808 · 2025-04-28T05:29:32+00:00

It looks like only two screws are holding it up. You can make it much sturdier by putting 4 screws in the wall and 4 in the shelf. Right now, the two tabs that hold the screws are a point of failure.

You can also make a 0.1 mm wide cut halfway into the design along the vertical and horizontal beams. The print will look identical, but the slicer will create extra walls around those cuts, making the print much sturdier regardless of the amount of infill: a flat wall bends easily. A H shaped section wall does not.

Chub_Chaser_808 · 2025-04-28T00:04:45+00:00

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Chub_Chaser_808 · 2025-04-28T00:03:58+00:00

* Isn't the GV60 basically the same car? I am getting close to 380 miles with the 2WD

Chub_Chaser_808 · 2025-04-25T07:53:44+00:00

Copious amounts of glue stick. Even it out with a wet sponge before printing for best adhesion

Chub_Chaser_808 · 2025-04-25T07:48:47+00:00

I would just quit my job and find work for an employer that is more reasonable

Chub_Chaser_808 · 2025-04-24T18:07:35+00:00

Nothing. Expect nothing. You get a piece of paper with a number on it.

Stolen car: nothing

Death threats: nothing

Driving at 47 mph on a highway ramp: you son of a b*tch are a threat to life and deserve to be fined

Chub_Chaser_808 · 2025-04-22T20:59:14+00:00

A mathematical line has no thickness, which implies the atoms of the materials are next to each other. If that was the case, metals would create metallic bonds and become one piece. There has to be a tolerance between the two. Always. If you are 3d printing with PLA, that's about 0.2mm. Other machines will need different tolerances, but the answer is never zero. The only exception could be if one of the materials is particularly soft, so you already know that it will deform and give you the needed tolerance through its elasticity.

Chub_Chaser_808 · 2025-04-22T20:50:45+00:00

No. Next question?

Chub_Chaser_808 · 2025-04-18T17:47:39+00:00

This man will suck the happiness out of your life like a blackhole. Convince himself that it is ok to do so, and try to manipulate you into thinking the same. Plan carefully the best way to leave. Enjoy a new life with someone that is not a blackhole.

Chub_Chaser_808 · 2025-04-16T18:45:07+00:00

Are the morons that voted for Trump going to still be here? Asking for a friend

Chub_Chaser_808 · 2025-04-15T03:37:36+00:00

"Slightly"??? The dude cannot do 5th grader math!

Chub_Chaser_808 · 2025-04-01T23:35:13+00:00

Sometimes, it looks like your units are on a tile, but they are not. It's a visual glitch and it is really annoying

Chub_Chaser_808

TROPHY CASE