How many nanometers are there in 1 cm?

##1## centimeter has ##10,000,000## i.e. ##10## million nanometers.

Standard unit in this system is ##1## meter.

There are a billion i.e. ##1,000,000,000## nano units in a standard unit and hence ##1,000,000,000## nanometers in one meter.

As there are ##100## centimeters in each meter,

##1## centimeter has ##(1,000,000,000)/100=10,000,000## i.e. ##10## million nanometers.