# Physics help needed :)

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#1
The liquid coolant has a freezing point below –20 °C. Explain one other property that the liquid coolant should have
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1 year ago
#2
Could you give some more context to the question?
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#3
(Original post by Sinnoh)
Could you give some more context to the question?
The bowl is used for making ice cream. The walls of the bowl contain a liquid coolant.The bowl is cooled to –20 °C before the mixture is put in the bowl. The bowl causes the mixture to cool down and freeze.
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1 year ago
#4
(Original post by sgdag)
The bowl is used for making ice cream. The walls of the bowl contain a liquid coolant.The bowl is cooled to –20 °C before the mixture is put in the bowl. The bowl causes the mixture to cool down and freeze.
Coolants work by evaporating to remove heat, so it needs to be quite volatile to evaporate at low temperatures.
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#5
(Original post by Sinnoh)
Coolants work by evaporating to remove heat, so it needs to be quite volatile to evaporate at low temperatures
Thank you! Sorry for bothering you but may you help me with this question as well?
Explain why the different thermal conductivities of metal and plastic are important in the design of the bowl.
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1 year ago
#6
(Original post by sgdag)
Thank you! Sorry for bothering you but may you help me with this question as well?
Explain why the different thermal conductivities of metal and plastic are important in the design of the bowl.
I'm guessing there's a diagram - could you post a photo of it?
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#7
(Original post by Sinnoh)
I'm guessing there's a diagram - could you post a photo of it?
Oops, im on my laptop so im not sure how i get the diagram on here but it is a bowl with an inner metal surface, with a liquid coolant around it and a plastic outer layer. Lol hope that helps xD
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1 year ago
#8
(Original post by sgdag)
Oops, im on my laptop so im not sure how i get the diagram on here but it is a bowl with an inner metal surface, with a liquid coolant around it and a plastic outer layer. Lol hope that helps xD
Plastic is low so the cold doesn’t escape to the surroundings metal is high so the cold reaches the ice cream to freeze it
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