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Excess Pressure in Bubbles

A glass tube,...

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A glass tube,sealed at both ends ,is 100cm long .it lies horizontally with the middle 10cm containing mercury.the two ends of the tube contain air at 27degreeC. and at a pressure 76cm of mercury.the air column on one side is maintained at 0degreeC and the other side is maintained at 127degreeC.calcyulate the length of the air column on the cooler side.neglect the changes in the volume of mercury and of the glass.

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Q. A glass tube, sealed at both ends, is 100 cm long. It lies horizontally with the middle 10 cm containing mercury. The two ends of the tube contain air at 27°C and at a pressure 76 cm of mercury. The air column on one side is maintained at 0°C and the other side is maintained at 127°C. Calculate the length of the air column on the cooler side. Neglect the changes in the volume of mercury and of the glass.

Q. A thin tube of uniform cross section is sealed at both ends. It lies horizontally, the middle

5

cm containing mercury and the two equal ends containing air at the same pressure P. When the tube is held at an angle

60^{o}

with the vertical direction, the length of the air column above and below the mercury column are

46

44.5

cm respectively. Calculate the pressure P in cm of mercury.(The temperature of the system is kept at

30^{o}

Q. A glass tube sealed at both ends is

1

m long. It lies horizontally with the middle

10

cm containing Hg. The two ends of the tube, equal in length, contain air at

27^{o} C

76

cm of Hg. The temperature at one end is kept

0^{o} C

and at the other end it is

127^{o} C

. Neglect the change in length of Hg column. Then the change in length on two sides is

Q. A glass capillary tube sealed at both ends is 90 cm long. It lies horizontally with a massless, thermally insulated pistion in the middle of neglegible thickness. The two ends of the tube which are equal in length contain air at

27^{\circ} C

and pressure of 1 atm. The air column at one end is maintained at 300 K and the other end is maintained at 375 K. (Neglect the change in volume of the glass ) What is the pressure now in cm of Hg?

Q. A thin tube of uniform cross-section is sealed at both ends. When it lies horizontally, the middle

5 cm

contains mercury and the two equal ends contain air at the same pressure

P

. When the tube is held at an angle of

60^{\circ}

with the vertical, then the length of the air columns above and below the mercury column are

46 cm

44.5 cm

respectively. Calculate the pressure

P

centimetres

of mercury.
(The temperature of the system is kept at

30^{\circ} C)

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