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How many grains equal 1lb?
There are approximately 7,000 grains in 1 pound.
How many liters are in 131.97 liters of water vapor at STP?
131.97 litres, of course!
How many cubical grains of ordinary table salt eqals one millimeter?
It would take about 1,000 grains of ordinary table salt to equal one cubic centimeter or one milliliter.
What role does condensation play in the watercycle?
Condensation in the water cycle is when water vapor cools and changes back into liquid water, forming clouds. This process is essential because it leads to the formation of precipitation in the form of rain, snow, or hail, which eventually returns to the earth's surface and continues the water cycle.
Does rainwater contain dissolved solids?
The answer is "yes": Rainwater does contain dissolved solids. A few things have to be known to understand how rains form. 1. There are many kinds of substances floating in the air in the form of tiny particles, e.g. dust, pollen grains. 2. The density of water vapor is lower than that of the air, therefore water vapor goes up in the air. 3. The higher the altitude, the colder it becomes. Water vapor cools down as it ascends in the air. The molecules of the cooled water vapor are attracted to the surface of the floating solid particles. It takes billions of water molecules to form a droplet. The droplets collide with each other and merge into bigger and heavier water drops. It takes about a million droplets to make a raindrop, which finally becomes so heavy that the air cannot hold it up any longer. Then many such drops fall out of the sky, and that's how the rain forms. The tiny solid particles floating in the air are very important--they are the bases of rain drops. In fact, without solid particles, there will be no rains no matter how much water vapor there is in the air. Artificial rainmaking is to spray very fine solid particles in the air so that water vapor can have bases to form water drops. Therefore, rainwater is not pure water, and there are many tiny solid particles within every raindrop. Some solid particles may dissolve in water, some not.
