|
Bream Anglers Tavern Drop in here if you're just surfing with a beer in your hand. Good place to just hang out... |
![]() |
|
Thread Tools | Rate Thread | Display Modes |
#16
|
||||
|
||||
Quote:
|
#17
|
|||
|
|||
https://www.pharmoutsourcing.com/Fea...nge-Materials/
The question is does adding salt to water significantly change the latent heat? We not to look at the amount of energy required rather than the actual temperature |
#18
|
||||
|
||||
![]() Quote:
![]() Theres so many things I dont know about how different substance retain temp that I'm scared to guess. But I'm hoping this is a bit like the "which is heavier - a kilo of lead or a kilo of feathers?" question. If they all have the same mass - they should have the same thermal energy? |
#19
|
|||
|
|||
Looking at latent heat the values I have found are
freshwater 333j/g seawater 330j/g ie. the amount of energy required to turn freshwater into ice is slightly more than but very similar to saltwater |
#20
|
|||
|
|||
I am slowly working my way through this as I haven't looked at physics since high school.
It gets more complicated as we also need to look at the concept of Specific heat. Specific heat represents the amount of heat required to change a unit mass of a substance by one degree Celsius. Increasing the salt concentration decreased the specific heat capacity of water. ie. saltwater will require slightly less energy to change temperature. I think the physics points to the same mass of saltwater ice being slightly less efficient in cooling compared to the same mass of freshwater ice. However the increase density of saltwater would push the equation the other way and more mass of saltwater would cool more efficiently that the slightly less mass of freshwater. In practice I think the actual measurable difference would be negligible and saltwater ice is very similar to freshwater ice in cooling ability Last edited by Kelvin; 27-07-2019 at 08:23 AM. |
#21
|
||||
|
||||
Quote:
I've just made another one that is supposed to match ocean water - 17.5 grams of salt in 500ml of fresh should do it - that dissolved much easier. |
#22
|
||||
|
||||
Well there has been a dramatic turn of events.
I've strung all the Vids together Last edited by yellow door 1; 28-07-2019 at 03:11 AM. |
#23
|
||||
|
||||
Well after an hour out of the freezer - it would seem the rumors are true.
Because Saltwater can get to much lower temps before freezing - it can give off much lower temps as it thaws. Once the fresh melts a bit - the water will give a 0.0 degree reading. Now all I have to find out is which one lasts the longest |
#24
|
||||
|
||||
Quote:
the fresh water which hovered around zero the whole time still has heaps of ice - theres a solid thick bar of ice running down the middle of the bottle Last edited by yellow door 1; 30-07-2019 at 07:37 PM. |
#25
|
||||
|
||||
|
![]() |
Thread Tools | |
Display Modes | Rate This Thread |
|
|