Final answer:
The end paper technique involving folding an end paper over the hair like an envelope is termed the bookend wrap. When blowing over a paper, it lifts due to Bernoulli's principle, which states an increase in fluid speed results in a decrease in fluid pressure.
Step-by-step explanation:
The end paper technique described in the question is known as the bookend wrap.
This technique involves placing a single end paper on top of the hair ends and folding it in half, wrapping the hair ends like an envelope. When blowing over the top of a sheet of paper held with its short edge parallel to your mouth, the paper will lift upwards. This behavior is due to Bernoulli's principle, which explains that as the speed of a fluid (in this case, air) increases, the pressure within the fluid decreases. When you blow over the paper, you are increasing the air speed over the top of it, which decreases the air pressure above it. The higher pressure below the paper then pushes it up, causing the upward motion.