Question

Как можно узнать, что воздух есть

Answer 1

Возьми книгу или журнал и взмахни

Answer 2

Помести туда человека если он будет дышать то там есть воздух а если нет то там нету воздуха 

Answer 3

How to Determine the Presence of Air

Determining the presence of air is relatively straightforward. Here are a few methods you can use:

1. Observation: One of the simplest ways to determine the presence of air is through observation. You can visually see the movement of objects, such as leaves rustling or flags waving, which indicates the presence of air currents.

2. Sensation: You can also feel the presence of air by sensing its movement against your skin. For example, you can feel a breeze on a windy day or when a fan is blowing.

3. Sound: Air can produce sound when it moves. You can listen for the sound of wind or air rushing through a space, such as when you open a door or window.

4. Effects on Other Substances: Air can have various effects on other substances. For example, air can cause water to evaporate or make a flame flicker. These effects can indicate the presence of air.

It's important to note that air is an invisible mixture of gases, primarily nitrogen (about 78%) and oxygen (about 21%), along with trace amounts of other gases such as carbon dioxide, argon, and water vapor.

Please let me know if there's anything else I can help you with!