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You preformed respirable dust sampling from $7$:$00$:$00$AM to $2$:$25$:$00$ PM

Pump calibration was conducted on site at sampling conditions. The overall average flow rate was $2\mathrm{.}51$ liters$/$min

The average conditions were $50F$ and $700mmHg.$

The concentration of dust is $\mathrm{.}023mg$

a$.$ Calculate the sample volume in liters and in cubic meters.

b$.$ Calculate the concentration of respirable dust measured in both $m\frac{g}{m}3$ and $u\frac{g}{m}3.$