用一个直径约5cm高约13cm的铁筒(罐头筒),上端钻一小孔,略细于火柴棍,下端边上用三角锉锉两个三角缺口(如图1)。实验时先将铁筒的小孔用火柴棍塞紧,固定在铁架台上,用铁圈压紧(如图2),再从下端的缺口处通入氢气,要多充些时间。然后 With a diameter of about 5cm high about 13cm in the iron tube (cans tube), drilled a small hole on the top, slightly smaller than the matchstick, the bottom edge of the triangle triangle with two triangular gap (Figure 1). In the experiment, the holes of the iron tube were first plugged with a matchstick, fixed on a metal stand, and pressed with iron rings (see Figure 2). Hydrogen gas was fed through the notch at the lower end and more time was needed. then