At What Temperature Does Water Freeze?
Oct 22, · Why Do liquids freeze? - Sandy (age 14) Rolling Hills Middle School, El Dorado Hills, CA. A: Since motion involves some kinetic energy, cooler things, with lower temperature, would move around less vigorously just because that's what the words 'lower temperature' mean. Controlled temperature cargo bins are also available when temperature-sensitive goods are being shipped. So your wine is unlikely to freeze if it only gets down to 7 degrees, but it's worth noting that in some exceptional cases (close to the outside, no insulation, extreme temperatures outside) it .
Follow-up on this answer. Learn more physics! Related Questions. Still Curious? Why Do liquids freeze? That's a nice deep question. When the atoms or molecules in a liquid are cooled, they don't rattle around thing much. Then they can stick better to each other. The hard part to understand then is not so much why liquids get stickier and have a harder time flowing when they're cold but rather why they abruptly form real eo of solid- ordered patterns of atoms or molecules.
These crystalline patterns are arrangements with lower energy than more general random arrangements. In other words, the molecules or atoms 'fit well' in these patterns.
So as you cool the liquid, these are the patterns they fall into. I still haven't said why what is pepperoni in italian is abrupt freezing, not just a gradual tendency of the molecules to form more ordered patterns as they get colder.
This is the interesting part. One molecule can't form any pattern by itself. Two molecules can't do much, because most of their surfaces won't even touch each other.
The amount the energy per molecule can drop by forming a pattern actually gets bigger as more molecules get involved. So once a pattern starts to form, it grows into a real crystal, not just a small cluster of lined-up molecules. One consequence is that when the liquid is cold enough so that it ought to freeze, it may take an extremely long time to freeze. The reason is that small clusters don't lose enough energy per molecule to make freezing 'pay'. Large clusters of the right type only how to fix cracks in gelcoat very rarely by chance.
Until one of them forms, the liquid sits in a 'supercooled' state. Mike W. One way of thinking of this is that the word 'temperature' stands for thjngs much extra energy is around per little part'. Since motion involves some kinetic energy, cooler things, with lower temperature, would move around less vigorously just because that's what the words 'lower temperature' mean. Now there's a more thungs, general meaning of 'temperature' which also gives the same result.
When more energy is present in some collection of molecules or atoms or whatever, more different states become available to that collection. It turns out that if there's lots of energy already present, much more is needed to double that number of states. So again, high temperature means lots of energy per part, and lots of energy means lots of motion.
Travel Stack Exchange is a question and answer site for road warriors and seasoned travelers. It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. I'm taking some freeze-sensitive items in a checked luggage for a short flight. It's cheese, chocolate, toothpaste and wine. I would like to know whether the luggage can get "frozen" in the aircraft.
Sometimes it happened to me that my stuff actually was quite cold after the flight, so I'd like to be quite sure.
Especially the cheese was really expensive and freezing it would very likely demage it. Usually I pack everything well in clothes, but this time the things are just too many so it's tough to do more than just protect the wine from breaking. Some details: It's an A flight taking 1. On an aircraft like one you're on, it's interesting to realise that the cargo hold is actually pressurised, just like the cabin.
The floor between the two is not a pressure bulkhead, so needs to be roughly the same or it could collapse from the pressure. However, as you've observed, the temperature is often cold as while the cabin is warmed, the cargo hold usually is not.
From a similar plane and written by a A pilot :. Conditioned air is directed from the cabin, so the air tends to be a little cooler by the time it reaches the cargo areas, which are also less insulated than the cabin. Cargo temperatures vary in our fleet. Controlled temperature cargo bins are also available when temperature-sensitive goods are being shipped.
So your wine is unlikely to freeze if it only gets down to 7 degrees, but it's worth noting that in some exceptional cases close to the outside, no insulation, extreme temperatures outside it may cause some freezing. Your best bet is to insulate it with some jackets or similar, like you've suggested you will do. Odds are, it'll be fine. Running a datalogger inside a checked suitcase between Paris and Sydney via Dubai showed the minimum temperature to be 13 degrees Celsius.
That occurred in the last 3 hours of flight. A change of aircraft at Dubai showed the temperature rise to Temperature and humidity were logged every 15 seconds. The datalogger was a recorder and not a transmitter. Transmitter equipment aboard aircraft is illegal. I am yet to marry data from the recorder against actual flight data available online, but aircraft typically travel at around feet, with an outside temperature of around minus The datalogger was placed against the side of the suitcase in a side pocket.
The suitcases position within both cargo holds was unknown. Hi I'm a flight attendant and have checked in freeze sensitive items like the above wines , cheese Yes, it's only 2 years but I do check in such stuff frequently between monthly and quarterly basis. I would stow them quickly in the fridge when I get home. Everything ended up fine and unspoiled. In fact, my greatest concerns and the greatest risk taken would be physical damages to the bag during the check-in-out process which may in turn damage my stuff.
Ground staff handling baggage may damage your bags accidentally. If you're lucky, it's a harmless scratch. A wheel missing? OK, still repairable. But have you ever seen bags badly cracked or dented lying sadly on the conveyor belt? A bad dent in the wrong place may cause a bottle to crack and soak all my stuff inside. Hope this helps. I've checked numerous freeze-sensitive things over the years.
Once, back in the 80s I had damage and that from a 1-hr flight. Since then everything has been fine, even on very long flights. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Will my checked luggage freeze in the airplane? Ask Question. Asked 7 years, 4 months ago. Active 4 years, 7 months ago. Viewed k times. Improve this question.
On a short haul flight like that, I'd have thought your biggest weather risks were on luggage carts between the terminal and the plane, rather than in the hold. May depend more therefore on the weather at both ends, and the promptness of baggage handling Gagravarr Well, the whether forecast is around 0C in both places, quite ok.
However, it's C outside the plane for cca 50 minutes which is crucial. Is the luggage part of the aircraft heated to the same temp as the cabin? Cheese can take being frozen, just do not re-freeze later. Add a comment. Active Oldest Votes. From a similar plane and written by a A pilot : Conditioned air is directed from the cabin, so the air tends to be a little cooler by the time it reaches the cargo areas, which are also less insulated than the cabin.
Improve this answer. Thanks Mark! If my stuff survives, I'll accept the answer. My flight is tomorrow night, please let us know by then? Well, everything seem to have survived. The suitcase was quite cold on touch, but its stomach was fine : — yo' Dec 22 '13 at Your bottle at We usually keep white wine bottles outside in the snow during winter. Panzercrisis Chocolate can melt in your checked luggage when it is sitting outside, depending on the weather at your point of departure or arrival.
This has happened to me. Show 3 more comments. Bob Bob 3 3 silver badges 3 3 bronze badges. This is a duplicate answer of: travel. Also the questions regarding your other answer hold here as well. Welcome to Travel SE in any case! Bob what were the aircraft types, please? The aircraft were both As. Show 1 more comment. Dee Dee 59 1 1 silver badge 1 1 bronze badge.