If you want to form a very rough idea of whether water is cold, lukewarm, or hot, first hold your hand above the water. If you feel heat radiate off of the water, it is hot and may burn you. If you feel no heat, the water will either be room-temperature or cold. Do not stick your hand directly into water—either in a kitchen or in nature—without first holding your hand above it to gauge the temperature. If the water container is large enough, dip one of your elbows into the water. This will give you a rough idea of the water’s temperature. You’ll be able to instantly tell if the water is hot or cold. Avoid putting your hand into water of an unknown temperature, as you could scald yourself. If you leave your elbow in the water or 5–10 seconds, you’ll be able to form a rough idea of the water’s temperature. If the water feels slightly warm, but not hot, it’s around 100 °F (38 °C).
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