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I have some problem in comparative sentence. For example:

In lower layer PS=10%

In upper layer PS=5%

For this I wrote the sentence as below:

  1. In lower layer PS is greater than upper layer.
  2. In lower layer PS is greater than that in the upper layer.

Grammatically, which sentence is correct? I am writing this sentence for a scientific article.

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    The second is correct. But don't forget you need the definite article - "In the lower layer..." – WS2 Feb 11 '18 at 19:06
  • @WS2 thanks for guidance. but I do not understand "But don't forget you need the definite article - "In the lower layer..." –" what this mean? – Safi ullah Feb 11 '18 at 19:41
  • In THE lower layer PS is greater than in the upper layer. – WS2 Feb 11 '18 at 22:14
  • In addition to inserting "the" in the second sentence (as WS2 has told you), I would delete "that". – Andreas Blass Feb 11 '18 at 22:54
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Both the sentences seem fine. The first sentence is more condensed form of the second one. Although, given that these sentences are meant for a scientific article. You can go for the following as well.

"In the lower layer PS is 10%, whereas in the upper layer it's only 5%"

Hope it helps

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