Snails are 1mm to 312 mm long. That means they don't weigh much...
33 mm is what i know
About 3.5 ounces.
M is 1000 times mm (meter and millimeter)
25mm = 3.973 kg/m
120 mm diameter, 1.2 mm thick
There are 10 mm in 1 cm
1 mm is 0.1 cm
1 meter is 1,000 mm.
1 cm = 10 mm so 25.1 cm = 251 mm
8 centimeters is blank times as long as 5 millimeaters
The US M3 artillery projectile weighed about 1 pound