What is the main difference between a raindrop and a cloud droplet?
What will be an ideal response?
ANSWER: An ordinary cloud droplet is extremely small, having an average diameter of 20 micrometers or 0.002 cm. A typical cloud droplet is 100 times smaller in diameter than a typical raindrop. If a cloud droplet is in equilibrium with its surroundings, the size of the droplet does not change because the water molecules condensing onto the droplet will be exactly balanced by those evaporating from it. If, however, it is not in equilibrium, the droplet size will either increase or decrease, depending on whether condensation or evaporation predominates.
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Indicate whether the statement is true or false
Superefficient and ultralight cars
a. may eventually get up to 300 mpg b. are not yet close to reality c. have been developed in Europe, but not the United States d. could get up to 50 miles per gallon in the future e. are fuel efficient, but not safe for human transport
Because they are of smaller scale, non-point source pollution sources are more easily regulated and controlled than are point sources
Indicate whether the statement is true or false
Which region has the least potential for hydropower expansion?
A. India B. China C. South America D. Central Africa E. United States