Aspirator Demonstration
 | A common device which makes use of the Bernoulli principle is the aspirator. When water is forced through a smooth constriction, the fluid velocity increases, lowering the pressure below atmospheric pressure. This can entrain air into the tube at the constricton and be used to partially evacuate the air from an attached volume. 利用伯努利原理的常见装置是吸气器。当水被强制通过一个光滑的缩颈部分时，流体速度增加，使压力低于大气压力。这可以将空气吸入缩颈处，并用于部分排出连接体积中的空气。 |
| But I'll bet you didn't think such a device could remove enough air so that the atmospheric pressure would crush a 55 gallon drum! But Dan Stamm, physics teacher at Campbell High School near Atlanta demonstrated just such an aspirator marvel in his physics classroom.
但我想你可能不会想到，这样一个装置能排出足够的空气，使大气压将一个55加仑的油桶压碎！但丹·斯塔姆，亚特兰大附近卡姆皮尔高中物理老师，曾在他的物理课堂上展示过这样的吸气器奇观。 |
|
The aspirator was used on the laboratory sink in Dan's laboratory room, and he had a pressure sensor attached to the drum. He lowered the pressure in the drum to about 40 kiloPascals, about 40% of atmospheric pressure. The drum used had a surface area of about 3000 square inches, so a 40 kPa internal pressure would cause the atmosphere to exert a net inward force of about 26,000 pounds or 13 tons on the walls of the drum. 在丹的实验室房间里，他将吸气器用在实验室水槽上，并在鼓室上安装了一个压力传感器。他将鼓室内的压力降低到约40千帕，约为大气压的40%。所用的鼓室表面面积约为3000平方英寸，因此40千帕的内部压力会使大气对鼓室壁施加约26,000磅或13吨的净向内力。
|
| Show movie
播放电影 |
Bernoulli concepts
| HyperPhysics***** Mechanics ***** Fluids
HyperPhysics ***** 力学 ***** 流体 | R Nave |