By increasing the temperature or decreasing pressure.
The water will not "disappear"; it will evaporate. If it's hot, water will evaporate faster.
moving the air above it
the salt is made of heat so it evaporate faster
You can make water in a glass evaporate faster by increasing the temperature in the room, adding heat directly to the glass, increasing air circulation around the glass, or lowering the humidity in the room.
Temperature will make water evaporate more quickly than wind. Wind will just separate the water molecules, which would then cause them to evaporate a little more quickly.
One way to make water evaporate faster is to increase the temperature of the water, as higher temperatures accelerate the rate of evaporation. Another way is to increase air circulation around the water surface, which helps carry away the water vapor molecules, facilitating faster evaporation.
Does not evaporate faster but does absorb so it will go away faster.
the water molecules move away, e.g. evaporate
funnel sand paper and something to put the water into
There are a couple of factors here that make it impossible to predict. In the dark, the plain water should evaporate more readily ("faster", all other conditions being equal). However, out in the sun, the food coloring may cause the water to absorb more energy from the sun's light, and therefore get hotter, which could easily negate the (probably small) colligative effects.
Water with salt will actually take longer than water without salt to evaporate. This is due to boiling point elevation. If you put a solute into water, it will make it more difficult to boil, and therefore will boil at a higher temperature. Since it takes longer for the salt water to boil, it will take longer for it to evaporate as well
When boiling water to make hot chocolate, the water molecules gain energy and begin to move faster, causing the water to increase in temperature. Eventually, the water reaches its boiling point, at which it starts to evaporate and turn into water vapor.