Which is always the first step in dealing with an accident in the lab

Immediately get the professor or teacher.

Explanation:

You most likely won't know how to handle the chemical you're dealing with; sometimes water isn't the best solution. Always inform the teacher first, then take whetever steps your teacher tells you. Please mark brainliest :)

i think slash and

water at room temperature is flowing through a pipe with pressure taps located 10 ft apart along one section of the pipe, which are connected to a mercury (s=13.6) manometer.