The question is highlighted, please help asap!

You have to use certain materials, so that's a limitation

Explanation:

You have to use certain materials, so that's a limitation because you can't use every materials in the world. You have to use certain ones.

i believe you meant to say air rather than hair so the answer is below ")

the dead sea, the lowest place on earth at 430 metres (1,410 ft) below sea level, has a correspondingly high typical atmospheric pressure of 1065 hpa.