The surroundings of a system can determine the temperature status of a substance. So in our daily lives, any substance or materiel that reflects heat can keep things cold at its best, especially if placed in a non sourced light ( because light transmits heat)
It keeps stuff cool
Paper is an insulator- it does not transmit heat well, so it keeps heat in (or out) of things.
A vacuum flask keeps hot things hot & cold things cold. Just how it tells the difference is one of the mysteries of the scientific world !
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Cotton keeps most things warm.yarn keeps things warm to
To keep things cold.
refrigerator
You can find a travel cooler and warmer that keeps things both hot and cold at amazon.com, www.crateandbarrel.com, www.keepyourcooler.com, and sears.com.
It keeps best cold
It keeps stuff cool
something that is cold and solid like ice but that stuff does not melt
Paper is an insulator- it does not transmit heat well, so it keeps heat in (or out) of things.
A vacuum flask keeps hot things hot & cold things cold. Just how it tells the difference is one of the mysteries of the scientific world !
Ice packs keeps lunches cold.
yes, wood is an insulator so it keeps things warm.
It is the name of the appliance that keeps foods and other things cold. Most of these machines have a compartment that keeps foods frozen called a freezer compartment.
It keeps the air trapped in side and has to layers with air as insulation in the middle