Cover Plastic Canvas
Posted in Sewing on 07/12/2004 12:26 am by admin
Why does the top 16th to 1/4 inch of water trapped in my canvas boat tarp freeze at temps above freezing ?
I have a boat that is covered with a canvas tarp that has water trapped in it from a previous winter rain. That water freezes at temps just below 40 degrees fahrenheit actually around 37 to 40 degrees. There is water right next to this in a plastic bucket that does not freeze, and also standing water on the concrete etc... that will not freeze. The only things around that get frost or frozen is the water in the tarp, the top of my car, shingles on the roof and the grass. So why will the water in the canvas tarp freezes above 32 degrees but the water in the plastic wont. I don't understand this. thanks for any answers. The air is usually very still on these nights and the skies are cleara and crisp, this is at sea level I live right on the coast, (Santa Monica, CA ). Does the material that the air come into contact with help to lower the temp a bit just above the specific materials(canvas, grass, etc...)?
What you describe is very common when - as you say - the sky is clear at night and there is no wind.
During the night, the heat of any object directed toward the sky, will be lost by radiation. Yes, electromagnetic energy from your tarpaulin is moving away at the speed of light into space! And so is it for everything else that is under open sky.
There is actually no limit to how cold it can get. Meanwhile, the air around it is a very good insulator and doesn't cool down that fast; hence you can see frost on the bonnet of your car even if the air temperature is above freezing point.
That lost of heat energy during the night is the reason you often see morning fog. The air is much colder near the ground than above and that creates an inversion; the air doesn't rise as during daytime and the moisture near the ground condenses into tiny water droplets.
The reason you bucket of water doesn't freeze is that, while the surface looses heat, it sinks at the bottom when it reaches 39 F, which is the temperature at which water is the densest and heaviest. In the process, new and warmer water is then coming on the top of the bucket.
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14 DECORATIVE FLY SWATTER COVERS Plastic Canvas BOOK US $3.99
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11 GREAT TISSUE COVERS Plastic Canvas PATTERN BOOK US $3.99
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COUNTRY BRICK COVERS IN PLASTIC CANVAS LEAFLET 2 CANVAS SHEETS US $3.19
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WINTER MOUSE TISSUE COVER Plastic canvas patterns US $.25
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FOOD WRAP COVERS Plastic canvas patterns Extra pattern US $.25
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LITTLE PIGGIES Plastic canvas patterns spoon cover napkin holder magnets US $.25
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