How does a pm unite compare to a meter?
pm is short for pico-meter, or 10-12 meter. That's a trillionth of a meter (using the short scale), or a billionth of a meter on the long scale.pm is short for pico-meter, or 10-12 meter. That's a trillionth of a meter (using the short scale), or a billionth of a meter on the long scale.pm is short for pico-meter, or 10-12 meter. That's a trillionth of a meter (using the short scale), or a billionth of a meter on the long scale.pm is short for pico-meter, or 10-12 meter. That's a trillionth of a meter (using the short scale), or a billionth of a meter on the long scale.