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If the liquid is moving, third degree burns (reddened skin) can occur within a few seconds, second degree (blisters) would take a bit longer. Deep tissue damage (first degree burns) would take longer yet, and might not occur at all depending on a number of factors, such as where the heat is applied. In all cases, the location of the heat on the body is a factor. The inside of the upper arm, for example, will suffer damage much faster than the palm of the hand. If you have a water heater with a thermostat, it is a good idea to keep it at about 120 degrees tops. This is hot enough for washing, minimizes the chance of burns, and will save energy. Even with a home diswasher, 120 degrees is hot enough. (Commercial dishwashers require higher temperatures because of the way they function.)

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Q: How long does it take for serious burn to occur with a liquid at a temperature of 140 degrees?
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