Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: What is the volume of a rain drop?

  1. Feb 1, 2005 #1
    One of my physics H-work questions asks, If one inch of rain fell on an one arce field, how many rain driops hit that field. I figure that each rain drop has a volume of .5 mL. Does this sound about right?
  2. jcsd
  3. Feb 2, 2005 #2


    User Avatar
    Homework Helper

    The best way is to see it. Make water drops and estimate the size. You find it in the range of mm, don't you? Assume that the water drops are spheres of 4 mm diameter. What is the volume of such a sphere? It is about 33 mm^3, isn't it? 1 mm^3 = 0.001 cm^3 = 0.001 mL. So the volume of my raindrop is 0.033 mL.
    Of course, a raindrop can be of 0.05 mL, but 0.5 mL corresponds to a raindrop 1 cm across, it is a bit too big, isn't it?

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook