Well, honey, if we're talking about a millimeter, which is one thousandth of a meter, and an atom is about 0.1 nanometers in size, then you'd be looking at roughly 10 million atoms across a millimeter. But hey, who's counting?
a millimetre
A millimetre.
Millimetre.
A micrometre. A millimetre would be too big a unit but a tenth of a millimetre should do fine.
None. A millimetre is a measure of length; weight would be measured in millinewtons.
a millimetre
A millimetre.
Millimetre for length, micrometre for thickness
Millimetre.
A millimetre.
Millimetre.
A micrometre. A millimetre would be too big a unit but a tenth of a millimetre should do fine.
A blender would be neither. A litre is not a measure of length, and a millimetre is far too small. I would estimate that a blender would be 15-20cm, i.e. 150-200 millimetres.
In ordinary circumstances, a millimetre, but if you are designing a minting machine, then a micrometre,
A millimetre. A millimetre. A millimetre. A millimetre.
None. A millimetre is a measure of length; weight would be measured in millinewtons.
I'd use inches, but centimeters could also work.