Why do instant noodles swell in Gaoyuan?

Because the atmospheric pressure of the plateau increases;

There is a vacuum in the sealed bag, not an absolute vacuum, and after reaching the plain, the pressure difference between the inside and outside of the instant noodle bag increases, which will cause bulging.

The increase in temperature does make the air in the bag expand, but the air in the bag is very scarce, and the expansion will never be so bad.

Possible cause: A large number of microorganisms produce a large amount of gas that makes it bulge.

The plateau has high altitude, low air pressure and low oxygen content, and the use of this low-pressure hypoxic environment can improve the physical endurance quality of the human body, so it has become a "treasure land" for endurance training in the sports world. In 1968, the 19th Olympiad was held in the highland city of Mexico City, and athletes from the African highlands won five championships, five runners-up and two third-place finishes in middle-distance running and marathon.

For every 100 meters of elevation, the atmospheric pressure drops by 5 kPa, and the partial pressure of oxygen drops by about 1 kPa. The Qinghai-Tibet Plateau has an average altitude of about 4,000 meters above sea level and is known as the "Roof of the World". The high altitude leads to the formation of low atmospheric pressure and low partial pressure of oxygen, which is also the root cause of the thin air and lack of oxygen in our region.

Due to the low atmospheric pressure and low partial pressure of oxygen, a small number of people, mainly high-altitude immigrants, often develop acute altitude sickness, high-altitude pulmonary edema, polycythemia and high-altitude heart disease due to high-altitude hypoxia.

The air pressure on the plateau is low, and the pressure is lower than that on the plain, and the instant noodles will swell.

When the well-sealed instant noodles are brought from the plain to the plateau, the bag is bulging because.

lipengzuxia lv9

When you bring well-sealed instant noodles from the plain to the plateau, the bag bulges because of the gas molecules inside the bag.

A The interval increases, B the mass increases, C the volume increases, and the D number increases.

Satisfied with the answer. 21st Century Education Network. lv40

Answer] A Answer Analysis] Test Question Analysis: When bringing well-sealed instant noodles from the plain to the plateau, the bag will bulge because the air pressure in the plateau area is low and the air pressure in the bag is large; The volume expansion of the gas is caused by the increase in the spacing of the gas molecules, and the molecules themselves are unchanged, so the volume, mass and number of molecules in the bag are unchanged. So choose A

Test Points: Analyze and solve problems using the properties of molecules and atoms.

Comments: Proficiency in the characteristics of microscopic particles is the key to solving the problem, that is, the mass and volume of particles are very small, there are gaps between particles, particles are in constant motion, and the spacing between particles is affected by temperature and pressure.