Because these are not values in units of centimetres and metres but in unitsOriginally Posted byrob3000

of centimetres to the power 4, and metres to the power 4. So if there are

100 centimetres in a metre there are (100)^4 centimetres^4 in a metre^4,

and 100^4 is 10^8.

Same here, but because there are 1000 millimetres in a metre we have aAnother example of this converts mm to m

eg. 50x150^3 / 12 = 1.406 x10^7 mm^4

= (50x150^3 / 12)x10^-12 m^4

= 1.406 x10^-5 m^4

Again, why to convert from mm to m is x10^-12 used???

scale factor of 1000^4=10^12 between millimetres to the power 4 and

metres to the power 4.

Example consider square centimetres and square metres. There are 10000

square centimetres in a square metre.

RonL