Topic: Thermodynamics
The density of air at 10 °C and 1MPa abs, in SI units is
- A. 1.231
- B. 12.31
- C. 118.4
- D. 65.0
Answer: B. 12.31
Explanation: T = 10 °C = 283 K. P = 1 MPa = 10^6 Pa. Using ideal gas equation P = rho * R * T, rho = P / (RT) = 10^6 / (287 * 283) = 12.31 kg/m³.