How much air pressure does it usually take to step on old-fashioned popcorn

Old-fashioned popcorn usually need 0.7 to 0.8 air pressure to step on.

Chinese old-fashioned popcorn machine is an ancient popcorn machine, popping popcorn that "bang" sound, is many after 70, after 80 Chinese people's childhood memories of fun, old-fashioned stove, gourd-shaped pressure cooker, sacks. This old-fashioned popcorn machine also appeared on the U.S. Discovery Channel well-known science program "Rumor Terminator", this video in the microblogging frantic forwarding, many netizens said, finally know how the raw corn is turned into popcorn, now it is difficult to see such a scene.

Expanded:

The old-fashioned popcorn machine is actually a pressure vessel, and the processed ingredients (usually corn, rice, fava beans, yellow rice, and other common grains) are put into the machine and covered. With the weighted rod and weighted tube *** with force, rotate the head screw to pressurize the cover to facilitate sealing. The popcorn machine rack to the stand, the lower with a stronger fire heating, while turning the popcorn machine through the rocker, so that the machine ingredients evenly heated and softened.

Because of the heat, the pressure inside the machine slowly rises, reaching the required pressure (different raw materials need different pressure) to stop heating, the popcorn machine twisted to one side, the mouth of the machine with a sack cover. The force of the tube set in the small elbow, and forcefully trigger the small elbow, so that it is loose with the big elbow of the buckle, so that under the action of the pressure in the machine, the cover is open, the machine's high-temperature and high-pressure gas with the processing of raw materials together with the jet out. Spraying process, due to the rapid decline in the outside pressure, making the internal gas inside the grain to the outside rapidly expanding, and thus the grain will be burst open.