Question

which sentence is correct?
commonly used in blimps and balloons, we know that helium is actually less buoyant than hydrogen but safer to use because it doesnt burn or react with other chemicals.
we know that helium, commonly used in blimps and balloons, is actually less buoyant than hydrogen but safer to use because it doesnt burn or react with other chemicals.

Explanation:

In the first sentence, the dangling modifier "Commonly used in blimps and balloons" is not clearly associated with the subject "helium". In the second sentence, the modifier "commonly used in blimps and balloons" is correctly placed next to "helium", making the sentence structure clear.

Answer:

The second sentence "We know that helium, commonly used in blimps and balloons, is actually less buoyant than hydrogen but safer to use because it doesn't burn or react with other chemicals." is correct.