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A heat pack is designed to warm up one's body to prevent swelling of injuries. A heat pack can be: an ice pack that is heated (containing a liquid or a gel with high specific heat) a heating pad that heats when you start the crystallisation process
Carbon tape heated trousers on Instructables [1] Heated jacket Heated glove. Most heated clothing is designed for cold-weather sports and activities, such as motorcycle riding, downhill skiing, diving, winter biking, and snowmobiling, trekking and for outdoor workers such as construction workers and carpenters.
Heating packs can also be made by filling a container with a material that has a high specific heat capacity, which then gradually releases the heat over time. A hot water bottle is the most familiar example of this type of heating pad. A microwavable heating pad is a heating pad that is warmed by placing it in a microwave oven before use.
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The release of heat is triggered by flexing a small metal disk in the hand warmer, which generates nucleation centers that initiate crystallisation. Heat is required to dissolve the salt in its own water of crystallisation and it is this heat that is released when crystallisation is initiated. [9] The latent heat of fusion is about 264–289 kJ ...
This mechanism allows portable heat wraps to maintain their heat for the entire 90-minute application, compared to conventional silicate-gel hot packs that start to lose heat at 15–20 minutes. Similar to silicate-gel hot packs, the average temperature increase of the paraspinal muscles is 2.2°C, at 1.5cm depth and 1.1°C at 2cm.