One end of the long water pipe is inserted into the bottom of the cup, and the other end hangs to a position lower than the bottom of the cup. Gently suck the drooping end, the water will stop sucking when it reaches the mouth, and the water will naturally flow out.

1. Prepare a soft plastic tube (or hose) with a length of about 3 to 4 times the height of the cup and an inner diameter of about 0.8 cm.

2. Fill the plastic pipe with water (no bubbles) and seal both ends of the pipe with two index fingers.

3. Put one end into the bottom of the cup, and the other end is lower than the bottom of the cup (the tube is still full of water), and then open the nozzle outside the cup.

Unit conversion

1L = 1000ml 1000ml = 1000 m3？ = 1 cubic decimeter

1 ml = 1 ml.

1 ml liquid water = 1 cm3 liquid water

1 ml The weight of liquid water at 4 degrees Celsius is 1 g.

1 ml = 1 cm3