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How many red blood cells are in a liter?
There are approximately 5 million red blood cells in a microliter of blood. Therefore, there would be 5 billion red blood cells in a liter of blood.
How many times lighter or heavier than a liter is a centiliter?
It is inappropriate to be talking about "lighter" or heavier" with regard to liters and centiliters (or milliliters or deciliters, etc.) Why? Because the liter (and its fractional parts) is a unit of volume or capacity, not weight. You may say that a liter is 100 times greater in volume than a centiliter. You could say that a liter is ten times greater in volume than a deciliter. You could also say that a deciliter is ten times greater in volume than a centiliter. But one is not necessarily heavier or lighter than another. Unless, of course, you have a liter and centiliter of the same substance! A liter of water, for example, will be 100 times heavier than a centiliter of water -- as long as both are at identical temperatures. (Water at 4 degrees Celsius is denser than water at higher and lower temperatures, so a liter of water at 4 degrees C will weigh more than 100 times a centiliter of water at higher or lower temps.)
How many times greater is the mass of bromine atom compared to a helium atom?
18.96 times greater = 19.96 times as great.
How many times greater is the radius of earth compared to Venus?
The radius of Earth is about 0.95 times greater than the radius of Venus.
How many times greater is a kilometer than a centimeter?
A kilometer is 100,000 times greater than a centimeter. This is because there are 100,000 centimeters in a kilometer.
