# Thread: Using OF in the expression of a quantity and its value

1. ## Using OF in the expression of a quantity and its value

Hello,

I am in doubt when using "OF" in the expression of a quantity and its value:

• ... the time step OF 0.1 s was used... vs. ... the time step 0.1 s was used... (I would use the former)
• ... a sample heated up to the temperature OF 200 °C was... vs. ...a sample heated up to the temperature 200 °C was... (I would use the former)
• ...the computational mesh with 100 thousand OF elements was... vs. ...the computational mesh with 100 thousand elements was... (I would use the latter)

Is there any grammar rule for this? The quantity followed by its value = "OF" is used; the value followed by the quantity = "OF" is not used?

2. ## Re: Using OF in the expression of a quantity and its value

I believe you made the correct choice in every instance. However, for a rule let's wait for someone smarter than me to come along.

3. ## Re: Using OF in the expression of a quantity and its value

Not that I'm necessarily smarter than Tarheel, but I concur that your choices are correct.

4. ## Re: Using OF in the expression of a quantity and its value

I'm waiting a smart person to answer these question.
Why the former is correct and latter is incorrect?

5. ## Re: Using OF in the expression of a quantity and its value

Originally Posted by lubajz
100 thousand elements
I think it is correct because we would say '100 people' rather than '100 of people', but I am not a teacher.

Originally Posted by Polyester
I'm waiting a smart person to answer these question.
It sounds to me as if you were asking obtuse people like me to shut up.

Matthew Wai,

7. ## Re: Using OF in the expression of a quantity and its value

Any opinion/explanation of a teacher or of a native?

8. ## Re: Using OF in the expression of a quantity and its value

The "why" questions are always the hardest to answer. This instance is an example of that. Perhaps additional context would have helped me come up with a rule or rules. Perhaps not.

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