Gas shed slogan

(1)( 1) To fill the gas container with water, fill the gas container with water until the liquid level rises, first cover a small part with a glass sheet, and then cover the bottle mouth with a glass sheet. Invert the bottle filled with water with the glass sheet in the sink; (2) When collecting gas by drainage method, cover the glass sheet under the water surface until big bubbles appear at the bottle mouth, and then take out the gas container; (3) Because the exhaled gas contains more carbon dioxide, the density of carbon dioxide is greater than that of air, so the bottle mouth should be upward.

(2) To collect gas samples in the greenhouse, we can creatively use the drainage method, that is, first fill the gas cylinder with water, then take it to the greenhouse for dumping and cover it with glass sheets.

Therefore, the answer is: (1)① Fill the gas container with water until the liquid level rises, first cover a small part with a glass sheet, and then flatten the glass sheet to completely cover the bottle mouth. Invert the bottle filled with water with the glass in the sink. ② Straighten the gas container. When there are big bubbles on the water surface, cover the glass plate under the water surface and take it out.

(2) First, fill the gas cylinder with water, cover it with glass, put it in the greenhouse, pour out the water, cover it with glass and take it out.