- #1
antonima
- 28
- 0
Originally posted on sciforumsDOTcom by me (DRZion):
So I came up with a scenario which is simple enough for anyone to understand.
You take a fluid which is liquid at room temperature, but freezes to a become a solid denser than the liquid.
This is done to any amount of liquid at the surface of a pool of liquid. The energy required to freeze this liquid is x.
Now, the energy released as the solid sinks is just (Ds-Dl)vgh
where
Ds is density of solid
Dl is density of liquid
v is volume of the frozen solid
g is gravity
h is height
Since x is a constant and energy released scales with depth of the pool (h), there must exist a depth where x < energy released.
When the solid melts the temperature of the pool decreases, but it can draw this heat from the room, which is at room temp. Hence ambient heat -> gravitational potential.
What says Physics Forums?
So I came up with a scenario which is simple enough for anyone to understand.
You take a fluid which is liquid at room temperature, but freezes to a become a solid denser than the liquid.
This is done to any amount of liquid at the surface of a pool of liquid. The energy required to freeze this liquid is x.
Now, the energy released as the solid sinks is just (Ds-Dl)vgh
where
Ds is density of solid
Dl is density of liquid
v is volume of the frozen solid
g is gravity
h is height
Since x is a constant and energy released scales with depth of the pool (h), there must exist a depth where x < energy released.
When the solid melts the temperature of the pool decreases, but it can draw this heat from the room, which is at room temp. Hence ambient heat -> gravitational potential.
What says Physics Forums?