Microgram

\[\begin{aligned} y[tonne] &= 1 \times 10^{-12}x[microgram] \\ y[Kilogram] &= 1 \times 10^{-9}x \\ y[gram] &= 1 \times 10^{-6}x \\ y[miligram] &= 0.001x \\ y[Imperial\ ton] &= 9.8421 \times 10^{-13}x \\ y[US\ ton] &= 1.1023 \times 10^{-12}x \\ y[pound] &= 2.2046 \times 10^{-9}x \\ y[ounce] &= 3.5274 \times 10^{-8}x \end{aligned}\]