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the density lowers
All of the forces exerted by the individual molecules in a fluid add together to make up the pressure exerted by the fluid
It warms up pools by Radiation.
It would sink until it was completely covered with water and then neither go farther down nor up.
"Any object, wholly or partially immersed in a stationary fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object." (Archimedes) And this is independent on the heat.
global warming
Your transmission fluid gets thicker [increased viscosity] as it cools overnight. This makes shift a bit stiff. As the fluid warms through use, or as the day warms up, the fluid thins, making shift easier.
the density lowers
Could be that your low on power steering fluid. When it's cold, the fluid is more viscus, but once it warms up and thins out there isn't enough.
Try checking the trans fluid. The level of the fluid drops when the engine becomes hot. Check the fluid with the engine idling with the trans in park.
I would check the transmission fluid level.
Because you don't have enough the transmission fluid in the system.
When your motor warms up your oil, gasoline, and transmission fluid; it helps your motor run free
Convection currents are caused by differences in density. Warmer fluid is less dense, so a fixed volume of the warmer fluid is lighter. Colder fluid is denser, and so heavier in a fixed volume. The colder, denser fluid presses down and falls below the less dense fluid, which floats up to the top of the fluid. Often, there is a heat source that the bottom of the container, so the fluid at the bottom, which was more dense, warms up and becomes less dense. At the same time, the fluid at the top cools down and becomes more dense, and so the cycle repeats, forming a convection current.
The transmission may not be building up pressure until the fluid warms up. Check the fluid level to make sure that its full, then check the transmission filter as it could be stopped up.
when the fluid is cold it will not flow through the transmission as well but when heated up it flows freely
The type of surface that warms up the slowest is the "ocean" surface.