For keeping goods cold during shipment, what is an advantage of dry ice (frozen carbon dioxide) ver water ice?

Answer 1

Well first off, the sublimation point of #CO_2# is #-78.5# #""^@C#. The freezing point of water is of course #0# #""^@C#.

As a bonus, carbon dioxide sublimes at normal pressure; unlike ice, which melts and sloshes around in your cooler, so temperature differentials are clearly a factor in the shipping of frozen goods, or even semi-frozen goods like ice cream. Having said all of this, the majority of items are shipped using standard refrigeration units.

And all of this at the cost of global warming! (Of course, additional processing and fractional distillation of air would yield the dry ice.)

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Answer 2

Natalie Anton

One advantage of dry ice over water ice for keeping goods cold during shipment is that dry ice sublimates directly from solid to gas, eliminating the mess of melting ice and avoiding potential damage to goods from water exposure.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.