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In regard to modification, change the dependent test variable to pressure as the results cannot be attribute the changes with one independent. Conduct all experiment within set temperature to avoid affecting the rate of reaction through the trials.

In regard to modification, change the dependent test variable to pressure, as the results cannot be attributed solely to one independent variable. Conduct all experiments within a set temperature to avoid affecting the rate of reaction throughout the trials.

To fix the grammar in the provided text, you can make the following revisions:

"In regard to modification, change the dependent test variable to pressure, as the results cannot be attributed to the changes with one independent variable. Conduct all experiments within a set temperature to avoid affecting the rate of reaction through the trials."