The formulae for finding density of air in kg/m3.
A. $$\frac{{0.4645B}}{{273 + t}}$$
B. $$\frac{{0.4645B}}{{273 + {t_u} + {t_d}}}$$
C. $$\frac{{{t_u} + {t_d}}}{{0.4645D}}$$
D. $$\frac{{{P_1}{V_1}}}{{{T_1}}} - \frac{{0.4645B}}{{273 + t}}$$
Answer: Option A
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