A company is introducing a new product called ”Joulies” which are small stainles

Question

A company is introducing a new product called ”Joulies” which are small stainless steel balls filled with a material that undergoes a phase change from solid to liquid at 60 C. The company claims that when put into a hot drink in an insulated cup, the ”Joulies” will rapidly cool the drink to 60 C and then the drink will remain at this temperature for a long time. Do you believe the claims of the company? If so, explain how the ”Joulies” can cool the drink but then keep it warm. If not, explain why they are incorrect.

Explanation / Answer

It depends upon the amont of Joulies and it's latent heat, specific heat, etc. It's like putting some ice into some water, if the amount of the ice is sufficiently high then it indeed happens that the water cools to zero degree and then remains at that temperature at least for some time which may be treated as long time scale of the problem.

When the hot drink cools its heat energy is being transferred to Joulies and after some time the Joulies reaches to 60 degree, and starts melting, at that time it takes a lot of heat from the drink as the latent heat of melting but at the same time remains in 60 degree, compelling the dring to stay in 60 degrees. If the drink is too hot or the amount of the Joulies is too small compared to that of the drink, then it's not going to happen for a long time.

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