[monaliza142]

مسأله رقم 56 من شابتر 13 من
كتابkane & sternheim
a sealed bottle has water in it and two tubes enter the bottle through the seal tube B is attached to a pump at one end and the other end is above the water surface . if tube A is immersed 0.15 m below the water surface and the other end is opened to the air, what is the minimum pressure obtained inside the bottle
what will occur when this pressure is reached

[physics-2012]

ترجم المسأله

[monaliza142]

زجاجة بها ماء وداخل لها من عند الفوهة انبوبتين ا و ب
الانبوبة ب متصلة بمضخة من ناحية ومن الناحية الاخري تكون فوق سطح الماء(غيرملامسة للماء) والانبوبة ا مغمور منها جزء مقداره 0.15 متروالناحية الاخرى في الهواء
ما هو اقل ضغط داخل الزجاجة

[mahmoud khodary]

Because the bottle sealed from atmosphere and because that the pump inlet pipe( pipe B ) is above the water surface , a negative pressure (vacuum ) will be occur above the water surface (below the atmospheric pressure) during pump operation , and the pressure within the water (inside the water) will be atmospheric pressure due to that one end of pipe A has been immersed below the water surface and the other end open to atmosphere , this causes that the water at the surface to be evaporated and the minimum pressure occurs inside the bottle is the water vapor pressure (corresponding to the temperature within the bottle

This will cause the water level inside the bottle to be below the distance of the end of tube A (below 0.15 m of the original water surface ) and then no more evaporation happened and the pressure inside the bottle will rises to the atmospheric pressure