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A micrometre (or micron) which is one thousandths of a millimetre. Or a nanometre, which is a millionth of a millimetre.
One millionth = 0.000001
1 million = 1,000,000 1 millionth = 1/1,000,000
1 micron is a millionth of a metre
Oil is slightly less dense than water and a litre of water weighs a kilogram. It would be less than a kilogram, but by how much depends on the type of oil.