Comments on: [anyqs] Hurricane Irene Edition

By: Susan

Susan — Sun, 18 Sep 2011 16:28:58 +0000

This is something that I never actually thought to do myself. And being that I never had to worry about a hurricane hitting my area of the country head on before Irene, why would I? This video provided me with some food for thought. How else would you know if your food was spoiled before you ate it? Maybe I will pose this question to my science class…

By: Chera

Chera — Thu, 15 Sep 2011 23:36:36 +0000

I love this and the thought provoking questions that a video like this ignites is phenomenal. I had to watch this video twice because I wanted to know why, how and what that had to do with the hurricane. I continued to read, so I did not think and draw my own conclusion, but I love that these videos do exactly that.

By: Nate

Nate — Fri, 09 Sep 2011 02:34:45 +0000

“The penny at the bottom of the glass of ice means that power was out long enough for the ice to melt all the way through.”

On the contrary, it seems to me that the penny may slide off the top of a partially melted ice chunk. The ice is not going to simply melt from the bottom up or top down, but I rather think there would be a stage with a big ball of ice floating in the cup, with a gap between the cup and the ice. This could roll or shift as it melts, resulting in a penny at the bottom long before the glass of ice has melted all the way through.

If this is true, then the penny could hit the bottom of the glass long before any food spoiled, and it would be a shame to chuck a freezer full of edible food. Are we assuming that the food is instantly spoiled when it is unfrozen? For some people, the logical difference between “conditions that thaw water” and “conditions that spoil a freezer full of food” is a non-trivial difference.

By: Frank

Frank — Mon, 05 Sep 2011 18:29:02 +0000

I agree with those who point out the coin will melt its way down through solid ice because of its own weight. We did an experiment along those lines in middle school science class with a wire and an ice cube and I’ve done it with a penny laid on an ice cube in the ice cube tray.

There is a better way, however. Take a used water-bottle, put a little water in it, and freeze it *upside down*. Then store it in the freezer *right side up*. If you ever find the ice at the bottom of the bottle, there has been a thaw. This eliminates the uncertainty introduced by the “ice skate effect”.

(Plus you can store it that way indefinitely so as to catch unexpected outages. It doubles as a lovely demonstration of sublimation as the ice vapors recrystallize in a downy beard down the side of the bottle over months.)

A second alternative is to massage your bags of frozen vegetables. If they are frozen solid, they have refrozen.

By: Eugene

Eugene — Mon, 05 Sep 2011 03:46:28 +0000

Unfortunately your example is context sensitive. In my neighbourhood, when there is a power outage, the circuit breaker will trip and has to be turned on manually.

By: Bre Wheat

Bre Wheat — Sun, 04 Sep 2011 21:38:55 +0000

Love it! I had my kids (ages 14 and11) watch it. The both had to think about it, but figured it out. I agree that it would make a great bell ringer.

By: DMT

DMT — Fri, 02 Sep 2011 16:56:02 +0000

I’m not quite sure, but I think it seems some people might be misundestanding the science. I think the point is that the penny will sink to the bottom not matter what. The weight of the penny will melt the ice locally, which will refreeze quickly.

I don’t know how long it would take, but coming back at different times would find the penny part way down frozen in ice.

I think colder freezers will slow this process a bit, but I don’t know the direct relationship offhand to temperature.

My act two would be showing those in between shots with the penny part way down, but still in ice.

By: Rhett

Rhett — Fri, 02 Sep 2011 13:36:53 +0000

A couple of comments. First, great video. Very artistic.

Second, I have evacuated for a hurricane before. My best analogy is Han trying to get the Millenium Falcon ready to leave Hoth (“Why do you take this apart now? I’m trying to get us out of here and you pull both of these.”)

Third, yes – stuff in a freezer can melt in a day. It depends on how good your freezer is. Some of them are old and not so insulated. Also, it depends on what else is in there. If you have a frozen turkey, this will help keep things cold (or better yet, fill the freezer with milk jugs of frozen water).

By: sheaphysics

sheaphysics — Fri, 02 Sep 2011 12:12:18 +0000

Is three days really long enough for it to fully defrost and refreeze?
Remember, the freezer is pretty well insulated and if it is not opened things are going to stay frozen for a few days (as I experienced throwing out all my still frosty food on day 2.5/4 with no power this week).

By: CalcDave

CalcDave — Fri, 02 Sep 2011 11:46:46 +0000

I didn’t understand the point from the original video. I guess I wondered what “magic of science” let the coin fall to the bottom. Like, somehow ice-water is still fluid enough if you give it enough time to let the more dense coin sink? Or maybe you have some trick freezer?

Maybe at the beginning of the clip you could say a line like, “Are you packed yet? We have to be at the airport in 30 minutes!” Then at the end show a blinking clock before opening the freezer. That would have let me know the point a bit better.