Light years, meters (pm), megabytes (Mm), kilometers (km), decimeters (dm), centimeters (cm), millimeters (mm), silk rice (dmm), millet (cmm), micron (micron), nanometer (nm), picometer (Pm) and so on. Their conversion relationship with rice is as follows:

1 light year = 9.46PM (approx. )

1pm= 10× 10^ 15m

1Mm= 1× 10^6m

1km= 1× 10^3m

1dm= 1× 10^(- 1)m

1cm= 1× 10^(-2)m

1mm= 1× 10^(-3)m

1dmm= 1× 10^(-4)m

1cmm= 1× 10^(-5)m

1μm= 1× 10^(-6)m

1nm= 1× 10^(-9)m

1pm= 1× 10^(- 12)m

1fm= 1× 10^(- 15)m

1am= 1× 10^(- 18)m

Forget the rest yourself, hehe.