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Sodium acetate trihydrate crystals have a melting point of 58 °C. When they are heated to around 100 °C, and subsequently allowed to cool, the aqueous solution becomes supersaturated. This solution is capable of supercooling to room temperature without forming crystals. By clicking on a metal disc in the heating pad, a nucleation center is formed which causes the solution to crystallize into solid sodium acetate trihydrate again. The bond-forming process of crystallization is exothermic, hence heat is emitted.
or for the regular joe explanation.
It's water in the pads, but made of special water molecules that hate thumbs. We'll call them "thumophobic" molecules.
When you squeeze the gel with your thumb and forefinger the thumbophobic water molecules fight like tracksuited single mothers in the Woolies sale to get away from the thumb.
As the water molecules rub against each other in the kerfuffle heat is created by the friction. This is what caused the pad to warm up.
When you boil them to get them ready for another go, the water molecules chill out in this small scale "hot bath" you have run for them, it gets them over the work they've done and they got to bed that night all ready to have another go tomorrow.
What else can I help you with?
How much work is done by the heat engine if it takes in 2000J of heat and rejects 1500J of heat?
Work done=Heat in-Heat out 2000-1500=500J
Which describes the work done by the heat engine?
A heat engine converts heat energy into mechanical work. It operates by taking in heat from a high-temperature source, using it to do work, and then releasing the remaining heat to a low-temperature sink. The efficiency of a heat engine is the ratio of the useful work output to the heat input.
The amount of work done by heat engine equals the amount of what?
The amount of work done by a heat engine equals the difference between the heat input and the heat output of the engine. This is known as the heat engine's thermal efficiency.
What is capacity to do work or transfer heat?
That would be energy. Energy is the ability of a system to do work or transfer heat.
How much heat is generated by 1700 joules of work?
The heat generated by 1700 joules of work depends on the efficiency of the process. In an ideal case where all the work is converted into heat, the heat generated would also be 1700 joules. However, in real-world scenarios, the heat generated would be less due to energy losses.
What are the release dates for Click - 1997 I In the Heat of the Click 1-3?
Click - 1997 I In the Heat of the Click 1-3 was released on: USA: 1997
Will alt click work with Firefox?
will "alt click" work in firefox 3.6
A heat engine is a device that converts work into heat?
No, a heat engine is not a device that converts work into heat. It is the opposite, which means it is a device that converts heat into work.
How do you prevent heat exhaustion?
Click on the link below.
How much work is done by the heat engine if it takes in 2000J of heat and rejects 1500J of heat?
Work done=Heat in-Heat out 2000-1500=500J
What is the difference between heat engine and heat pump?
Heat Engine is the system that converts the Heat energy into mechanical work while Heat pump converts the work into heat
Which describes the work done by the heat engine?
A heat engine converts heat energy into mechanical work. It operates by taking in heat from a high-temperature source, using it to do work, and then releasing the remaining heat to a low-temperature sink. The efficiency of a heat engine is the ratio of the useful work output to the heat input.
How do you quit your job on sims 2?
you click on the phone and you click on work and click quit job
Does alt click work with MacBook Pro?
No,but control click works
Heat given off by fireplaces is an example of?
convection to heat the room conduction to heat the metal work and brick work
Why does your heat only work when your car is moving?
The heat will also work when the car is turned on, but not moving. It uses heat from the engine.
What does control click mean?
the answer does not work!
