Réponse :
pression ( pressure ) in the air space :
= 105 hPa ( ≈ 1,52 PSI )
Explications :
■ BONJOUR !
■ "1,5 meter of oil" --> height = 1,5 meter ( ok ? )
■ A closed tank contains 1.5 m of SAE 30 oil (p= 890 kg/m³) , 1 m of water, 20 cm of mercury(p= 13568 kg/m³), and an air space on top. If Pton = 600 hPa, what is the pressure in the air space?
■ prenons un réservoir de surface au sol 1 m²
■ masse d' huile ( oil ) ?
masse = Volume x 890 kg/m³ = 1,5 m³ x 890 kg/m³ = 1335 kg
■ masse d' eau ( water ) = 1000 kg
■ masse de mercure ?
0,2 x 1 x 13568 = 2713,6 kg .
■ on aura le réservoir ainsi :
air --> ( top )
oil -->
eau -->
mercure --> high density
■ Poids ( weight ) TOTAL des liquides :
(1335+1000+2713,6) x gravité = 5048,6 x 9,8 ≈ 49476 Newton .
■ pression ( pressure ) due aux 3 liquides :
p = Poids/Surface ♥
= 49476 Newton/1 m² = 49476 Pascal ≈ 495 hPa .
■ pression ( pressure ) in the air space :
600 - 495 = 105 hPa ( ≈ 1,52 PSI ) .
■ use french language please !
