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22 May, 01:57

A soap bubble has a diameter of 4mm. Cakculate the pressure inside it if the atmospheric pressure outside is 10^5Nm^2. The surface tension of soap = 2.8 * 10^-2N/m

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Answers (2)
  1. 22 May, 02:16
    0
    Look it up it will give the right anwser
  2. 22 May, 02:23
    0
    The formula for determining the pressure inside a soap bubble is expressed as

    Pi - Po = 4T/r

    Where

    Pi represents the pressure inside the bubble.

    Po represents the pressure outside the bubble or the atmospheric pressure.

    T represents the surface tension.

    r represents radius of the bubble.

    From the information given,

    Diameter of bubble = 4mm. Converting to meters, it becomes

    4/1000 = 0.004m

    Radius of bubble = 0.004/2 = 0.002m

    T = 2.8 * 10^-2N/m

    Po = 1 * 10^5Nm^-2

    Therefore,

    Pi - 10^5 = 4 * 2.8 * 10^ - 2/0.004

    Pi - 10^5 = 28

    Pi = 28 + 1 * 10^5 = 100028Nm^-2
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