Sensor A reads 1.5 kPa (gage). The fluids are air, gasoline, and glycerin. The densities at \(20^{\circ} \mathrm{C}\) are approximately:
- Gasoline: \( \rho_{\text{gasoline}} = 680 \, \text{kg/m}^3 \)
- Glycerin: \( \rho_{\text{glycerin}} = 1260 \, \text{kg/m}^3
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