The acid turns to water. Batteries will freeze in cold weather if they are discharged.
When the battery is charged, the water turns back to acid.
sulphuric acid
In all honesty the fluid or electrolyte is water. And the relative density of water as the state of charge decreases is also decreased.
When temperature decreases, a fluid will eventually freeze and become solid
When a fluid moves, the fluid pressure decreases. This is due to the conservation of energy principle, where the kinetic energy of the moving fluid is converted from the pressure energy of the fluid. The pressure decreases as the fluid gains velocity.
When pressure in a fluid changes, the volume and density of the fluid may also change. If the pressure increases, the volume decreases and the density increases, leading to compression of the fluid. Conversely, if the pressure decreases, the volume increases and the density decreases, causing expansion of the fluid.
As buoyant force decreases then the body starts sinking down.
When a fluid is compressed, the volume of the fluid decreases while the pressure and temperature increase. This leads to an increase in the density of the fluid.
The speed increases and the pressure decreases.
You need to add electrolyte and charge the battery. You will then know if it is ok. It may be fine, and it may not be.
Helps the battery to hold charge for a long period of time by charging the cells of the battery. So always check if you need to top off the battery acid fluid in your battery if its not servicable battery then you cant really check it you will need a special tool that you hook up to it that will read for you if battery still has good or bad charge.
As I know you will not need to charge a battery if your charging system is working right but if you leave your lights on or whatever just go to any auto zone and they will charge it for you in about a hour( i know that because i work there) but anyways also you can check your fluid level in the battery in any 350z.
When the density of a fluid gets hotter, it usually decreases. This is because as the fluid gets hotter, its molecules gain energy and move farther apart, causing the fluid to expand. This expansion leads to a decrease in density.