Panadol (or paracetamol) wont dissolve in cold water.
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Sugar does not dissolve in oil as it does in water. Since oil and water are immiscible, sugar will not dissolve in oil.
This depends on the temperature, stirring, ratio milk/water, time of adding water to powder, volume of the water aliquotes, etc.
Aleve typically starts to dissolve in the stomach within 20-30 minutes after ingestion. The active ingredient in Aleve, naproxen, is absorbed into the bloodstream and then begins to exert its effects.
This mainly depends on the quantity, temperature and movement of the fluid by stirring and the amount and kind of other dissolved substances (eg. ionic strength)
There are very few solids which, given enough time, do not dissolve in water, including rocks. For this reason, water is often called "the universal solvent," although there are some things which will not dissolve in water. But there are many factors that affect solubility (the ability of a substance to dissolve) in water. For example, common table salt (a rock) dissolves easily in water -- until the water is saturated, at a given temperature and pressure. Afterwards, no more salt will dissolve. Plastic, if considered to be a solid, may be insoluble. Fats and oils will not dissolve in water.