A set of internationally accepted units to aid in communication of measurements.

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Different units in the equations of electrostatics in macroscopic media

I have the usual equations of electrostatics in macroscopic media expressed in Gaussian units: $$\nabla\cdot\vec{D}=4\pi\rho$$ $$\nabla\times\vec{E}=0$$ $$\vec{D}=\vec{E}+4\pi\vec{P} \tag1$$ My ...
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How to convert lb/MMBTU to concentration?

This might be a stupid question but... I am looking over this document for allowable emissions for PM particles in biomass furnaces. They are given in lbs/MBTU, pounds per million British Thermal ...