During daytime, plants take in carbon dioxide and release oxygen in the process of photosynthesis in the presence of sunlight. However, they even respire simultaneously and hence also take in oxygen and release carbon dioxide. But the production of oxygen is more than the production of carbon dioxide. Hence, if we sleep under a tree during daytime, we may get a good amount of oxygen, thus giving us a nice sleep. However, at night, plants do not perform photosynthesis due to the absence of sunlight. But respiration still goes on. Hence, as compared to oxygen, the proportion of carbon dioxide around the trees is more. Thus, if we sleep under a tree at night, we may feel suffocated due to lack of oxygen. Moreover, inhalation of excess carbon dioxide is harmful to our lungs and health. Therefore, it is not good to sleep under a tree at night.

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Generally, the air surrounding us or objects does not show any pressure because it surrounds with equal pressure.

In this science activity, we will observe that air shows its pressure when the opportunity is given.Egg moving into the bottle without touching by external sources proves that air pressure is acting upon it. Let us discuss it in detail.Before the experiment begins, the pressure of the air surrounding and inside the jar is the same as it is equally distributed.That means the pressure inside and outside the glass bottle is the same at the beginning of the experiment.But when we placed the burning paper into the glass bottle, the air inside the jar starts to expand. Because air molecules expand when it gets warmed up, and this is the specific characteristic of air.And as soon as the egg is placed upon the opening of the glass bottle, the fire goes off, and the air molecules begin to cool down.As the air molecules cool down, they start contracting themselves by lowering the air pressure inside the glass bottle.That means there is a difference in the air pressure existing inside and outside the glass bottle.Because there is less air pressure inside the bottle. The egg slowly squeezes into the bottle as the outside pressure pushes it from outside.Yes, when the air molecules inside the bottle cool down, it offers more space to welcome additional air molecules.In this process, the outside air molecules rush into the bottle to fill the spaces. So, it keeps pressure on the egg and helps it slip down into the bottle.

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When we heat air, the kinetic energy of these molecules increase and they begin to move farther apart from each other. In this way volume of air increases and we say that air has expanded. On the other hand, when air is cooled down, the kinetic energy of its molecules decreases.

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