How do instant cold packs work? 🧐🥶 Instant cold packs work by using an endothermic reaction: you squeeze the pack to break an inner bag of water, which mixes with a solid compound like urea or ammonium nitrate. This mixing process absorbs heat from its surroundings, including the air and anything the pack touches, making it feel cold! #science #physics #technology #knowledge #howitsmade | Learning with Lyrics

1K views · 51 reactions | Humidity is the measure of how much water vapor is in the air. High humidity goes to low humidity. In the same vein, water vapor in the air moves from higher concentration to lower concentration. To watch the complete video on the 4 Basic Energy Rules for HVAC, head on to our website or click on the link below. https://www.youtube.com/watch?v=Eow-Vioalwk #HVAC #hvaclife #airconditioning #Refrigeration | HVAC School | Facebook