London: Good news for the coffee lovers who don`t want their drink too hot or too cold, as scientists have come up with new metal beans which they say can keep your
beverage in a drinkable temperature for hours.
The beans, called Coffee Joulies, cool down your beverage to a normal temperature very quickly and then maintain that temperature for up to five hours.
According to inventors Dave Petrillo and Dave Jackson, the beans work by absorbing extra thermal energy in the drink when it`s too hot, and then releasing that stored energy back into the drink to keep it at an optimum temperature as it begins to cool down, the Daily Mail reported.
While this might seem to go against the laws of thermodynamics, Coffee Joulies contain a "special non-toxic material" sealed within the beans` stainless steel shells.
A spokesman said: "This material is designed to melt at 140 degrees Fahrenheit, and absorbs a lot of energy as it melts. This is how Joulies cool your coffee down three times
faster than normal.
"Once it reaches this temperature, the special material begins to solidify again, releasing the energy it stored when it melted. This is how Joulies keep your coffee warm twice as long."
Using Coffee Joulies couldn`t be simpler; all you have to do is add a few to your drink as soon as it`s poured, as the beans take up 15 per cent of the volume of a mug or flask, the inventors said.
And you don`t have to be a coffee lover to get the most out of the beans -- they work in any hot drink, be it tea, hot chocolate or milk, they added.
Unfortunately, the beans -- which are due to shortly go on sale in the US with a retail price of USD 50 for a bag --only work at their best when the cup is insulated with a lid.
One needs to place them in a standard kitchen mug and Coffee Joulies will keep the drink in the optimum temperature range for only a few minutes longer than usual.
In a thermos flask, however, the beans would keep the coffee at the perfect temperature for up to five hours.