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what additional volume of liquid (in c.c.) can be put into the beaker?

 
 
unimpo
 
Reply Fri 30 Mar, 2018 08:54 am
A glass beaker is completely filled with 456 c.c. of a liquid when both the glass beaker and the liquid are at a temperature of 33.3oC. If the glass beaker and the liquid are cooled to 5oC. what additional volume of liquid (in c.c.) can be put into the beaker? Volumetric coefficient of expansion of liquid is 0.000109K-1 and the coefficient of linear expansion for glass is 3.2X10-6K-1
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Type: Question • Score: 1 • Views: 1,170 • Replies: 3
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fresco
 
  2  
Reply Fri 30 Mar, 2018 01:04 pm
@unimpo,
Check out the temperatures you give. It doesn't make sense.
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Blickers
 
  1  
Reply Fri 30 Mar, 2018 09:18 pm
@unimpo,
Quote unimpo:
Quote:
A glass beaker is completely filled with 456 c.c. of a liquid when both the glass beaker and the liquid are at a temperature of 33.3oC. If the glass beaker and the liquid are cooled to 5oC.


Fresco is right. The question makes no sense as written since beaker and liquid going from 33.30 C to 50 C are not being cooled, they are being heated.
Recheck the figures you posted.
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ekename
 
  2  
Reply Fri 30 Mar, 2018 09:29 pm
OK, this is my best guess on a topic new to me.

The temperature drops from 33.3 degrees C to 5 degrees C.

"The volumetric expansion co-efficient of ethanol is 0.00109 per degree C."
https://www.engineeringtoolbox.com/cubical-expansion-coefficients-d_1262.html

In the equation below I assumed you accidentally put one too many zeroes in your figure for the volume expansion co-efficient.

"The change in the units volume when temperature changes can be expressed as:
dV = V0 β (t1 - t0)
where
dV = V1 - V0 = change in volume (m3, ft3)
β = volumetric temperature expansion coefficient (m3/m3 oC, ft3/ft3 oF)
t1 = final temperature (oC, oF)
t0 = initial temperature (oC, oF)"

Thus

dV = (456) x (0.00109) x (-28.3) = 14.0662 cm^3

(as per the formula above using the toolbox calculator)



https://en.wikipedia.org/wiki/Thermal_expansion
"For isotropic materials the volumetric thermal expansion coefficient is three times the linear coefficient."
Glass is isotropic.

The linear expansion co-efficient of alpha times 10^-6 (3.2X10-6K-1) has an immaterial effect of the capacity of the beaker (0.13 cm^3).

The engineering toolbox site includes calculators and worked examples on volume changes to liquids and linear changes to materials.



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