# Thread: 1 / 1000 is ...

1. ## 1 / 1000 is ...

Greetings,

I need some help from our experts for a paper I'm writing at the moment.

In English one per one hundred is percent,

one per one thousand is

a) promille
b) per mille
c) should I use a decimal fraction instead.

A prompt reply will earn my most sincere gratitude.

2. Either say one per thousand or use a decimal.

3. Thanks, so much Tdol.
The magnitude I need to express is the slope (or gradient) of a tunnel under construction. In civil engineering, such changes in elevation are typically expressed in parts per thousand. In my mother tongue 'promille' is a valid expression in this context, hence my question. T.K.

4. I've never heard it and Googlesuggests it'snot English:

5. ## Re: 1 / 1000 is ...

Originally Posted by Tomasz Klimkiewicz
Greetings,

I need some help from our experts for a paper I'm writing at the moment.

In English one per one hundred is percent,

one per one thousand is

a) promille
b) per mille
c) should I use a decimal fraction instead.

A prompt reply will earn my most sincere gratitude.
Promille - used for blood alcohol contents (at least in German)
.001 is linnear meassure; per milliliter (liquid),
Mil - used for thickness (6mil plastic is .006 inch think)

I would use decimal fractions especially in Europe. Can you give me some details?

6. twostep,

The English paper I'm working at just now is on construction of a sewerage duct using a state-of-the-art technology called microtunnelling. I won't go deeply into technical details; the point is that it's a general-purpose wastewater collector working as a gravitational flow duct, that's why it needs to have a negative gradient towards its end. That gradient, or slope, is expressed in metres per / 1000 m, meaning the difference in elevation after each kilometer of the duct (the exact number may vary over the whole length of the sewer). All in all, I gave up that 'promille' notion for the sake of clarity, and simply used m / 1000 m, which is just the same. Consulted some civil engineering manuals, and it's O.K.

Cheers! T.K.

7. Originally Posted by Tomasz Klimkiewicz
twostep,

The English paper I'm working at just now is on construction of a sewerage duct using a state-of-the-art technology called microtunnelling. I won't go deeply into technical details; the point is that it's a general-purpose wastewater collector working as a gravitational flow duct, that's why it needs to have a negative gradient towards its end. That gradient, or slope, is expressed in metres per / 1000 m, meaning the difference in elevation after each kilometer of the duct (the exact number may vary over the whole length of the sewer). All in all, I gave up that 'promille' notion for the sake of clarity, and simply used m / 1000 m, which is just the same. Consulted some civil engineering manuals, and it's O.K.

Cheers! T.K.
Sewage duct may be a better term. Are you talking about hydrocyclones?

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