Questions tagged [unit]

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Weibull distribution Units - ENGIEQSOL

I am using Engineering Equation Solver, and it has been telling me the units of my distribution are inconsistent. According to a the book I am reading, I think it should be unitless (as it is a ...
10
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7answers
3k views

Forgotten time units

As my kids are counting down to Christmas, I came to wonder how did people measure time through history. More precisely I wonder about unit systems for precision time keeping of years past gone. I am ...
2
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5answers
427 views

What is the accepted way to write units when specifying multiple dimensions?

When writing out dimensions in the form height x width x depth, what should you write for the units? For example, I can think of a few ways to approach this (assuming each dimension is measured in ...
2
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1answer
61 views

How to set measure display units in Solidworks drawing?

I have already set millimeters in document propertis, nevertheless the display units are meters Why and how to fix?
-1
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1answer
1k views

Converting flow rate from normal/standard liters per minute to cubic meters per second

I'm really confused about these three units commonly used for measuring airflow: cubic meters per second (m3/s) normal liters per minute (NLPM) standard liters per minute (SLPM) I would appreciate ...
1
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2answers
197 views

Questions about newton metre units

I have a few values in Newton metres and I need to make sure each value is an SI unit for calculations. However when I try to search for the units I am given, I can only find similar, but not quite ...
3
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2answers
169 views

Engineering calculations in a tool that will handle units

I know Mathcad handles units along with numbers which makes it easier to avoid errors by tracking units the way we would by hand. e.g. 250 kW + 500 W I just ...
3
votes
1answer
55 views

Unit Conversion for Mass Density

I am doing a Finite Element analysis of a continuum. In my problem definition I use these units: mm for length, kPa for applied stress, and MPa for material stifness (Young's modulus). With these ...
1
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1answer
53 views

US customary units below 1 mil/thou?

I have been asked to provide some of our technical docs in both metric and US units. For the most part, that is easy enough: approx 1cm → approx 1/2" 500μm → 0.02" But then I start getting stuck: ...
1
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3answers
188 views

What's the current nomenclature for “English” system of units?

Is the term "English units" still in current everyday use? I do hear this term among other engineers I work with but I'm unsure if this is a localized usage or is consistent with the wider community. ...
4
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1answer
603 views

How do you convert “kps” to Pounds per Square Foot (psf)? [closed]

I'm looking at a soil bearing capacity report, which has a column labeled "kips" and the values are followed by "kps". A "kip" is 1000 pounds, but I'm not sure how to convert from "kps" to psf. The ...
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0answers
97 views

Did the pressure unit “bar” change definitions since the 1930s?

I don't see anything in Wikipedia about it, but (from this question) when I try to reproduce the equations in this 1933 paper, I get values 106 away from the values in the paper. When I reproduce ...
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2answers
174 views

How do I denote someone weight

How do I say my weight? In which SI units? I see people are using Kg as a unit of denoting weight from my childhood. Answer this question "What's your weight?".
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2answers
3k views

Darcy to SI permeation units

How can permeation units in Darcy be converted to the SI form. For example, how would 9.0 x 10-6 darcy be converted to SI units of permeation? How would it also be converted to the permeation units: (...
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1answer
42 views

I need clarification on how pressure is measured

I have a vessel that has a pressure measuring device. The value it shows as the pressure inside the vessel is 6 inches of water column. Is inches of water column meant to always be used as gauge ...
1
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2answers
91 views

Units to use in this formula?

Should standard SI units be used in this formula or are other units supposed to be used for the formula for stress in a thin-walled spherical pressure vessel? $$\sigma_{yield}=\frac{P_g r_i}{2t}$$ ...
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1answer
255 views

Definitions of strength?

Can tensile strength be the same as yield strength? Can Flexural Yield Strength be related to the yield strength of a material in any way?
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1answer
110 views

What is pros of weight density?

I've been studying mechanical simulation with nastran/patran, nowadays. I knew weight density is used in imperial unit system, instead of mass density. I feel using weight density is tedious, ...