The pressure at gage \( A \) is 1.5 kPa (gage). The fluids are air, gasoline, and glycerin. The densities at \( 20^{\circ} \mathrm{C} \) are approximately:
- Air: negligible compared to liquids
- Gasoline: \( \rho_{\text{gasoline}} \approx 680 \, \text{kg/m}^3
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