Thermodynamics and Temperature - Science Theater 11

[navdanji]

please add similar videos in large numbers.its a lot of fun and informative.

[mbshus]

Is the reason the ice melts on the aluminum instead of the stryofoam because of the varied densities, or because of the chemical make-up? If you used a different substance to set the ice on, or varying densities, what would the effects be? What if you used the same aluminum and styrofoam but had different sizes of them with ice added?

[sciencetheater]

@mbshus The densities isn't too much of a factor, it is more about the chemical composition. However, the _amount_ of heat absorbed (or released) (not the RATE or speed of release) is typically measured in energy per mass (Joules per gram, for example...)

[mbshus]

Is the reason the ice melts on the aluminum instead of the stryofoam because of the varied densities, or because of the chemical make-up? If you used a different substance to set the ice on, or varying densities, what would the effects be?

[Merdam9]

You are awesome!

[nanone1994]

oky ........ i do understand thermodynamics but i still didnt understand how it melted right away!!! without heating the piece of aluminium ...!! i mean here in the experiment :S  are u saying its possible to grab a piece of aluminium and put an ice cube and it will melt right away !!!!!! im so confused :(

[psp10004]

@nanone1994 heating isn't necessary because aluminium is over the melting temp, only thing that matters how fast aluminium can transmit heat to ice. think about being naked in super cold water vs. being naked in air at the same temp... same stuff

[sciencetheater]

@nanone1994 psp10004 has it correct. The aluminium and the plastic are the same temperature, but the aluminium can give away its heat much faster than the plastic square. (If you checked the temperatures, the aluminium square is MUCH colder than the plastic square after the first ice cube melts...)

[BrokenAeroVT]

@nanone1994 Aluminum has a higher "conductivity" than the foam. It conducts heat within itself faster. In the aluminum case, once the heat beneath the ice starts to flow into the ice to melt it, the heat in the aluminum not directly under the ice is able to replace the lost heat directly under the ice much faster than in the foam. This keeps the temperature differential between the ice and the aluminum high, providing a higher wattage ( time rate of change of heat) of heat transfer.

[astone2020]

 great video