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Old Apr 16, 2008, 10:01 PM   #1
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Cowzrul
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Default Density of SAE 30 motor oil at 100 degrees celcius

Does anyone know an easy way to find this? My fluids professor is a bastard and always uses cases for problems that you can't get the values for out of the book and have to google search for hours to find them.
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Old Apr 16, 2008, 10:08 PM   #2
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Its a standard of measuring Lubricants for viscosity.
Example.
Viscosity: 11.5- 13.99 @ 100 degrees C.

Look in the product info.
That should be good enough to find it.

Less than 30 sec on google.
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Old Apr 16, 2008, 10:09 PM   #3
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Quote:
Originally Posted by Rad2owns View Post
Its a standard of measuring Lubricants for viscosity.
Example.
Viscosity: 11.5- 13.99 @ 100 degrees C.

Look in the product info.
That should be good enough to find it.

Less than 30 sec on google.
viscosity != density.

Thanks anyway, I figured it out by finding the SG and finding the density of water at 100 degrees, which ought to be close enough.
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Old Apr 17, 2008, 08:32 AM   #4
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Quote:
Originally Posted by Cowzrul View Post
viscosity != density.

Thanks anyway, I figured it out by finding the SG and finding the density of water at 100 degrees, which ought to be close enough.
Specifc gravity is density.

Use a density of 1000 kg/m^3 for water.
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Old Apr 17, 2008, 09:34 AM   #5
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Specifc gravity is density.

Use a density of 1000 kg/m^3 for water.
I used 958 kg/m^3, because that is the density of water at 100 deg, and multiplied it by .88, because that is the SG for SAE 30 oil, and it seemed to give a reasonable number.
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Old Apr 17, 2008, 10:23 AM   #6
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i like chips!
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Old Apr 17, 2008, 10:45 AM   #7
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Quote:
Originally Posted by Cowzrul View Post
I used 958 kg/m^3, because that is the density of water at 100 deg, and multiplied it by .88, because that is the SG for SAE 30 oil, and it seemed to give a reasonable number.
generally the reference for SG of liquids is water @ 4C. At that temperature, water's density is about 1000 kg/m^3.

Though, to be fair, SG is fairly nebulous across different industries and countries so your result is probably close enough.
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Old Apr 17, 2008, 03:04 PM   #8
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Old Apr 17, 2008, 03:12 PM   #9
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i like chips!
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Old Apr 17, 2008, 03:18 PM   #10
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pay attention in the future. Thanks.
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Old Apr 17, 2008, 03:20 PM   #11
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seriously are density and viscosity so easily confused by the general population?

I use it on a daily basis at work so I may not be typical, but do most people not know the difference between density and viscosity?
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Old Apr 17, 2008, 03:44 PM   #12
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Quote:
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pay attention in the future. Thanks.
oops

I saw motor oil in the subject and assumed viscosity- I admit to my horrible, unforgiven, bad reppin error
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Old Apr 18, 2008, 12:12 AM   #13
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generally the reference for SG of liquids is water @ 4C. At that temperature, water's density is about 1000 kg/m^3.

Though, to be fair, SG is fairly nebulous across different industries and countries so your result is probably close enough.
Well, I was wanting the density at 100C, so I figured using the density of water at 100C would make for a better approximation, because using the SG and density of water at 4C would give me the value of the oil at 4C, no? Which would be somewhat higher than said oil at 100C.


Quote:
Originally Posted by Bob Bobbles View Post
seriously are density and viscosity so easily confused by the general population?

I use it on a daily basis at work so I may not be typical, but do most people not know the difference between density and viscosity?

Apparently they are. Of course, I've never really had to use viscosity for anything until I got to this Fluid Mechanics course. Density, sure, used that back in high school physics, and probably even well before then, but I'd wager most people don't have a complete grasp of exactly what viscosity means.
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Old Apr 18, 2008, 12:21 AM   #14
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Quote:
Originally Posted by Cowzrul View Post
viscosity != density.

Thanks anyway, I figured it out by finding the SG and finding the density of water at 100 degrees, which ought to be close enough.
Crap sorry mis read.
Just ask NASA!
http://media.nasaexplores.com/lessons/03-040/9-12_1.pdf


Density for 5W-30 876 kg/m3

Density for 10W-30 881 kg/m3
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Old Apr 18, 2008, 12:27 AM   #15
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Originally Posted by Rad2owns View Post
Crap sorry mis read.
Just ask NASA!
http://media.nasaexplores.com/lessons/03-040/9-12_1.pdf


Density for 5W-30 876 kg/m3

Density for 10W-30 881 kg/m3
Those values are for 20 degrees celcius, and I've already finished and turned in the homework, I no longer care what the value is. IIRC I used a value of ~856 kg/m^3, in case anyone is STILL interested.

Also, XXW-30 oil isn't exactly the same as SAE 30, although I think the density value is similar to the 10W. (At room temperature)
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