From this thread, I just posted: [forums.macresource.com]

... I just discovered that I need to be able to convert from

kilogram / cubic meter

to

pounds

I am assuming that when someone states that something is, say, 5.1 lb. weight, they are referring to pounds per something... usually the foam weight/density is given as "5.1 lb." or "1.8 lb.", etc.

Of course, it would also help if Ikea told you the thickness of the foam layers...

Bunch of stuff comes up on google for kilogram to pound:

[www.google.com]

Not so sure about the results on cubic meter:
[www.google.com]

Hope helps.

---

OWC Larry
Other World Computing
[www.macsales.com]

Hi Larry,

Thanks. Yes, I have a nice widget which will do those kinds of conversions...

However, it gives me a peculiar result in the final calculation.

For example, to convert 50 kg/m3 to lb. weight, I am getting an unbelievable number...

I'm guessing the problem might be that I don't know what unit the pound weight is per...

Ahh, wait a sec, Larry's second link seemingly gives the answer...

50 kg/m3 = 3.1 lb/ft3

26 kg/m3 = 1.6 lb/ft3

... which, if correct, would mean that Ikea's memory foam is really substandard (the good stuff is 5.1 lb); their regular foam is also not too great (good is considered 1.8 lb; lousy or fair is 1.5 lb)

Do you mean convert kg/m3 to lbs/m3? or to lbs/ft3 or what.

kg/m3 is a measure of density - you can't convert it to a measure of weight.

hal, yes, I think already covered in my above posts... it's really density, but people typically refer to it as "weight"

not sure about the most commonly used unit for density, but I would *guess* it's pounds per cubic foot?

let's see, I use your example, 50 kg/m3 that is:

50 kg = 110 lb (since 1 lb is 0.454 kg)

1 m = 3.28 ft (since 1 ft = 12 inch and 1 inch = 25.4 mm)

Let's CUBE that and we get 1m^3 = 35.3 ft^3

noe back to the original density:

50 kg/m^3 = 110 lb / 35.3 ft^3 = 3.11 lb /ft^3

Now this number is in your expected range, right (you mention 1.8 and 5.1 "lb")

hope this helps (and why was your result unbelievable, you forgot to cube the feet to meter conversion?)

As a chemist I always use dimensional analysis. [www.chemistrycoach.com]

kg/m^3 to lb/ft^3

kg/m^3 * 2.2 lb/kg gives lb/m^3

kg/m^3 * m^3/35.3 ft^3 gives kg/ft^3

so the conversion factor is 2.2/35.3 = 0.0623

50*0.0623 = ~3.12

---

BT


Signed parental releases are on file for all tattooed minors.

I've used foot pounds in my calculations.

For example, if you buy a pound of pigs feet, and the package has 2 whole ones, that is .5 pounds per foot.

In addition, they make great arms for small snowmen.

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Edited 2 time(s). Last edit at 12/13/2005 08:42PM by Jimmypoo.

Yup guys, we all came to basically the same answer through different means... the issue for me was that I wasn't sure if it was lbs/cubic foot or what.

3.1 lb/ft3 is really pretty lousy for memory foam. Most would say that at least 4 lb/ft3 is required, and best would be > 5 lb/ft3.

Until jimmypoo's reply, I was beginning to get a headache. But now, thanks to him, I have a stomachache instead.



(I figured I'd go easy. There were a lot more offensive pics I found.)

Chicken.

Jimmypoo Wrote:
-------------------------------------------------------
> Chicken.

No, pigs feet. :p