Infrared Thermometer: The Ultimate Hack to Know If Your Laundry Is Tru

The Science

Your skin is lying to you. When you touch a piece of laundry that feels cold, your brain interprets that sensation as wetness, but it's actually only detecting temperature and pressure. The evaporation of water cools the fabric, and that thermal difference is what you perceive, not moisture itself. This phenomenon, known as evaporative cooling, is the same reason sweat cools your body. When you touch a damp garment, water on its surface evaporates rapidly upon contact with your skin, drawing heat away and creating a cold sensation that your brain mistakenly associates with "wet."

Diego Fernández, a chemical engineer and content creator, explains it clearly: "Human skin cannot differentiate between wet and cold." On cold days or in poorly ventilated spaces, a dry garment can feel just as cold as a wet one, leading you to make mistakes when hanging or storing clothes. In fact, in environments with high relative humidity, evaporation slows down, making the temperature difference between a dry and a wet garment minimal, further confusing your senses.

The trick Fernández proposes is simple but ingenious: use an infrared thermometer—the same device you use to measure a pan or oven temperature. First, aim it at a dry reference surface (a wall, a table), then at the suspicious garment. If they show the same temperature, the clothes are dry. If the garment reads lower, it still retains moisture. The reason is that water evaporating from the fabric absorbs energy in the form of heat, lowering the surface temperature of the garment. An infrared thermometer detects this thermal radiation with precision down to tenths of a degree, something human skin cannot match.