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By definition, insulation has low thermal conductivity so it slows the transfer of heat. We insulate homes to help them stay warm in the winter (by slowing the rate at which the heat moves out of the house into the colder surroundings) and to keep them cool in the summer (assuming they are air conditioned, by slowing the rate of heat moving through the walls from the hot outside into the cooler inside). Since it requires work to create a temperature difference, insulation allows less work to maintain that difference over time. Insulation also can provide protection against large deviations from ambient temperature. We use insulation in the form of gloves and "hotpads" to allow us to take hot items out of an oven, to cover steam pipes so that people don't get burned on them (and, of course to keep the steam hot and usable), to insulate containers of liquid nitrogen, etc.

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