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(a) The pressure inside an alveolus with a $2.00 \times 10^{-4}$ - m radius is $1.40 \times 10^{3}$ Pa, due to its fluid-lined walls. Assuming the alveolus acts like a spherical bubble, what is the surface tension of the fluid? (b) Identify the likely fluid. (You may need to extrapolate between values in Table $11.3 .$ )

(a) $\gamma=0.07 \mathrm{Nm}^{-1}$(b) The fluid is either water at $20^{\circ}$ or blood plasma at $37^{\circ} .$

Physics 101 Mechanics

Chapter 11

Fluid Statics

Fluid Mechanics

University of Washington

Simon Fraser University

University of Sheffield

University of Winnipeg

Lectures

03:45

In physics, a fluid is a s…

09:49

A fluid is a substance tha…

01:23

(a) The pressure inside an…

00:39

What is the pressure insid…

01:30

At $20^{\circ} \mathrm{C},…

07:15

Water discharges from a ho…

03:10

A pressure difference of 6…

03:00

Consider the venturi tube …

03:18

A certain fluid has a dens…

05:36

A hypodermic syringe is at…

04:26

A Venturi tube may be used…

00:42

Consider the manometer in …

03:52

A hypodermic syringe conta…

05:59

A cylindrical container wi…

06:36

Water moves through a cons…

01:22

An underwater air bubble h…

03:30

A compressed air cylinder …

06:43

(a) What is the pressure d…

03:12

The surface tension of a l…

02:12

A liquid $(\rho=1.65 \math…

04:04

A straight horizontal pipe…

04:01

A manometer using oil (den…

we're told that the pressure inside and Alvey Ole's with a 2.0 times 10 to the minus forthe meter radius is 1.4 times 10 to the third pass gas to the fluid line walls. Assuming the al viola acts like a spherical bubble bubble, what is the surface tension in the fluid and identified the likely fluid. So the pressure inside is 1.4 times 10 of the third Pascal's. The Radius is, um, 0.2 millimeters. Our equation for the pressure relating to the radius and the surface tension is P inside or the delta. P across the wall is four times the surface tension divided by the radius so we can solve for the surface tension in terms of the pressure on the radius and plug in our numbers, and we get that. The surface tension is 0.7 news per meter, which is pretty close toe being blood plasma at 37 degrees

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