What is the purpose of a rain gauge? a. to measure the amount of rainfall b. to predict how much rain is going to fall c. to predict whether or not it is going to rain d. to measure the temperature of the rain

A rain gauge is an instrument used to measure the precipitation in a determined amount of time (usually the depth of the precipitation, in millimeters). This is a little container that collects the water during a rain, and is useful to measure the amount of rainfall.

They are usually little bottles or cylinders that collect the water and had a graduated scale that permits a direct measure.

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.