# The temperature at which water boils is higher than that of water

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#### hhtt21

##### Key Member
"The temperature at which water boils is higher than that of water". I would like to ask that if this self-made sentence is grammatically correct and natural?

Thank you.

#### GoesStation

##### No Longer With Us
Its grammar is OK but it fails the logic test. The temperature at which water boils is exactly the same as that of water which is boiling; it's higher than that of water which isn't boiling; and it's lower than that of superheated water.

#### probus

##### Moderator
Staff member
"The temperature at which water boils is higher than that of water". I would like to ask whether this self-made sentence is grammatically correct and natural?

Thank you.
.

#### hhtt21

##### Key Member
But aren't whether and if interchangeable for this kind of case?

Thank you.

#### hhtt21

##### Key Member
What do you think about this: The temperature at which water boils at a higher pressure is higher than that of which boils at a lower pressure?

Thank you.

#### andrewg927

##### Senior Member
Put a period after higher and before that and get rid of the rest.

#### GoesStation

##### No Longer With Us
What do you think about this: The temperature at which water boils at a higher pressure is higher than that [STRIKE]of[/STRIKE] at which it boils at a lower pressure?

That's better, with my corrections. You can express the same fact more directly with fewer words: The boiling point of water increases with pressure.
Replace "boiling point" with "temperature at which water boils" if you want to avoid a term which might require clarification.

#### probus

##### Moderator
Staff member
Yes they are. Your "that" makes it wrong.

I would like to ask "if"... not "that if".

#### hhtt21

##### Key Member
Put a period after higher and before that and get rid of the rest.

I cannot understand this so would you please write it openly (frankly/clearly)?

Thank you.

#### andrewg927

##### Senior Member
Your original sentence: The temperature at which water boils at a higher pressure is higher than that of which boils at a lower pressure?
My suggestion: The temperature at which water boils at a higher pressure is higher.

#### hhtt21

##### Key Member
Yes you have put a period after higher but you didn't put a period before that.

Put a period after higher and before that and get rid of the rest.

Thank you.

#### andrewg927

##### Senior Member
Of course I did. Look:

....pressure is higher.than that of...

Isn't that period before that?

#### hhtt21

##### Key Member
Of course I did. Look:

....pressure is higher.than that of...

Isn't that period before that?
But isn't it even ridiculous than ungrammatical? By puttin a period you ended the sentence after that you continued with a small letter.

Thank you.

#### andrewg927

##### Senior Member
No. I was illustrating to you that the period I put was before "that". There wasn't a sentence after the period.

#### emsr2d2

##### Moderator
Staff member
The period I can see is before "than". Admittedly, that means it is also before "that" but it is not immediately before "that".

#### andrewg927

##### Senior Member
I see why hhtt got confused now.

#### Tdol

##### Editor, UsingEnglish.com
Staff member
Opening as requested

#### hhtt21

##### Key Member
Can we change the position of "at a higher pressure" in the sentence: "The temperature at which water boils at a higher presssure is higher than that at which it boils at a lower pressure" as "The temperature at which water at a higher pressure boils is higher than that at which water at a lower pressure" making the phrase an adjective instead of an adjverb?

#### jutfrank

##### VIP Member
Can we change the position of "at a higher pressure" in the sentence: "The temperature at which water boils at a higher presssure is higher than that at which it boils at a lower pressure" as "The temperature at which water at a higher pressure boils is higher than that at which water at a lower pressure" making the phrase an adjective instead of an adjverb?

Yes, it would still be understandable but I wouldn't advise it. The sentence reads better with at a higher pressure after the verb boils.

#### hhtt21

##### Key Member
I know we can change some relative clause sentences into cleft sentences such as "Here is where we met" to "It is here that we met". So how could we change the sentence: "The temperature at which water boils at a higher pressure is higher than that at which it boils at a lower pressure"?

Is this O.K:"It is the temperature that water boils at a higher pressure is higher than water boils at a lower pressure"?

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