When working with compressed air what psi should you reduce to if using the compressed air for cleaning? a. 30psi b. 40psi c.50psi d. 60psi

What is the main difference between trace elements and the main elements that make up the body? 1) main elements consist of heavier atoms. 2) trace elements are only needed in small amounts. 3) trace elements consist of heavier atoms. 4) main elements are only needed in small amounts.