Final answer:
Oxygen supports combustion and can make combustible materials catch fire when exposed to it. To ensure safety, inert gases like nitrogen or argon should be used instead.
Explanation:
Oxygen should not be used to blow off a welder's clothing because oxygen supports combustion. Combustible materials like clothing can catch fire when exposed to oxygen. For safety, it is important to use inert gases like nitrogen or argon instead.
Learn more about Oxygen in welding safety here:
https://brainly.com/question/4695733
