Let's look at the surface tension of the liquid metal mercury. Mercury has an unusually high surface tension, about 465 dyn/cm. Calculate the excess pressure inside a drop of mercury 4.00 mm in SOLUTION SET UP AND SOLVE We first convert the surface tension y to Sl units: diameter. y= 465 dyn/cm = 465 x 10 N/m. Now we have 27 (2)(465 x 10-3 N/m) P- Patm R 0.00200 m = 465 Pa 0.00459 atm. REFLECT The excess pressure (the difference between the inside and outside pressures) is a very small fraction of the atmospheric pressure. Part A - Practice Problem: What would the diameter of the drop be if the inside pressure were 5 atm? Express your answer in millimeters to three significant figures. ΑΣφ ? x•10" d = mm Submit Previous Answers Request Answer

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Let's look at the surface tension of the liquid metal
mercury. Mercury has an unusually high surface
tension, about 465 dyn/cm Calculate the excess
pressure inside a drop of mercury 4.00 mm in
diameter.
SOLUTION
SET UP AND SOLVE We first convert the surface tension y to Sl units:
y= 465 dyn/cm = 465 x 10 3 N/m.
Now we have
(2)(465 x10-3 N/m)
0.00200 m
27
p- Patm
R
465 Pa
= 0.00459 atm.
REFLECT The excess pressure (the difference between the inside and outside pressures) is a
very small fraction of the atmospheric pressure.
Part A - Practice Problem:
What would the diameter of the drop be if the inside pressure were 5 atm?
Express your answer in millimeters to three significant figures.
?
x•10"
d =
mm
Submit
Previous Answers Reguest Answer
Transcribed Image Text:Let's look at the surface tension of the liquid metal mercury. Mercury has an unusually high surface tension, about 465 dyn/cm Calculate the excess pressure inside a drop of mercury 4.00 mm in diameter. SOLUTION SET UP AND SOLVE We first convert the surface tension y to Sl units: y= 465 dyn/cm = 465 x 10 3 N/m. Now we have (2)(465 x10-3 N/m) 0.00200 m 27 p- Patm R 465 Pa = 0.00459 atm. REFLECT The excess pressure (the difference between the inside and outside pressures) is a very small fraction of the atmospheric pressure. Part A - Practice Problem: What would the diameter of the drop be if the inside pressure were 5 atm? Express your answer in millimeters to three significant figures. ? x•10" d = mm Submit Previous Answers Reguest Answer
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