In a room without air, can a person float

Air is not equal to gravity, only people who lose gravity will float.

The force exerted on an object due to the attraction of the earth is called gravity. The object of gravity is the center of the earth. The direction of gravity is always straight downwards.

The gravitational force experienced by the object is proportional to the mass of the object, and the calculation formula is: g=mg, g is the proportionality factor, the gravitational force is about, and the gravitational force changes with the change of latitude, indicating that the gravitational force of an object with a mass of 1kg is. The point at which gravity acts on an object is called the center of gravity.

This concept only applies to the vicinity of the ground. What to do about studying the gravity of objects in space at high altitudes or even beyond Earth?

The concept of gravity needs to be enhanced, broadened and deepened, and it deserves serious study. In order to study gravity scientifically, it is necessary to first clarify the research environment of gravity, that is: the research scope and reference frame.

Why do you still use a frame of reference? Because the concept of gravity hides the acceleration of kinematics! This is where the "mystery" that was unearthed when the concept of gravity was raised.

It is agreed that gravity should be studied in the static range, and the support of the object placed or the object itself should be a non-inertial frame.

Elastic force, friction force, electric field force, etc. only act on the part of the object and cannot make the object gain weight.

The force that gives weight to an object is not only the gravitational force, but also the inertial force. Because they both act on every prime element of the object at the same time. So the concept of gravity is elevated to:

The combined effect of the gravitational force and the inertial force that gives weight to an object is called gravity. This is where the concept of gravity after lifting comes in.

The gravitational force on the same object can vary under different circumstances, and when it is greater than the normal value, it is called overweight, and when it is less than the normal value, it is called weightlessness. This is a noticeable change from the concept of gravity.

At this time, the concept of gravity was much more applicable to any celestial body, artificial celestial body, and flying vehicle in the universe, including, of course, the Earth.

The scientific explanation is to pay attention to ventilation, otherwise the air is not good for health.

It is best not to live in such an environment, living in a cramped space for a long time, people's mentality is easy to be unbalanced, and then affect the judgment of things and things, which is not conducive to action, and will eventually damage health, which can not be cured and made up for by no amount of money.

If there is no window in the room, the air circulation must be not smooth, on the one hand, the concentration of carbon dioxide is high, on the other hand, due to the lack of ventilation, the various toxic and harmful gases produced in the room cannot be eliminated, and it is still harmful to the body.

A room without windows definitely has an effect on the body. The fresh air outside can't enter the room, the air is not circulated, it feels like a lack of oxygen, the whole person is dizzy, and in the long run, it will cause diseases, please pay attention!

If the room is not well ventilated, it will affect the normal breathing of the person, and if it is very closed, it may cause suffocation.

In order for man to float, he needs to overcome the gravitational pull of the earth (or the gravitational force on which man is subjected). There are usually the following situations: 1. People float up in the water by relying on the buoyancy of the water greater than or equal to gravity; 2. When people float up in space, it is actually the centrifugal force greater than or equal to gravity when people rotate around the earth at high speed; 3. The magician floats up in the air, some rely on the magnetic force generated by the phase magnet to overcome gravity, and some rely on the rope to hang up.

In short, be sure to overcome gravity. In a vacuum chamber, there is no air, no buoyancy can be created to overcome gravity, and there is not enough centrifugal force to rotate around the earth at high speed, so it cannot float.

The moon and the earth and the sun also exist in the universe in a vacuum, but they are attracted to each other and do not float in the universe casually!

No, people still have gravity under a vacuum, and only weightless people will float.

No, people are not separated from the gravitational pull of the earth in a vacuum.

Definitely not, the vacuum has nothing to do with the gravitational pull of the earth.

No, it was just dead, and the blood vessels burst and died.

Vacuum? What do you mean? Can you still live when the air is drained?

Who said weight loss in vacuum???

You're wrong, this is the earth!

In general! 3 days because after 3 days, he will die!

According to the national first-class air quality standard, there should be 30 cubic meters of fresh air per person per hour indoors, and 25 cubic meters of fresh air per person per hour in the second-level standard. You didn't say anything about the air standard.

Normal people breathe about 30 times per minute, each time about l of air is inhaled, a day and night inhalation of 18000 l of air, 24 kg, 10 times the total amount of food, of which 1 5 is oxygen, the purpose is to ensure the full oxidation of food and release enough energy. If you stop breathing for a few minutes, the person will die.

Winter in a room where there is no air inflow for a long time. It can be abstracted as a person in a confined space. People want to breathe and dissipate heat. It will increase the temperature in the room. And because the size of the space does not change, the molecular weight of the gas does not change. So according to PV=NRT

The pressure increases.

Playing the harmonica has nothing to do with pressure, and under normal conditions, indoor and outdoor pressures are equal. And it should be louder indoors and quieter outdoors. You check. This is due to the reflection of sound.

What happens if there is no air inflow in a room for a long time in winter?

No change. For example, Xiaoqiang plays the harmonica in the room, and feels that the sound of the harmonica is very small, but when he goes out of the room to go to the water, the sound of the harmonica is much louder, may I ask if this has anything to do with the pressure? Independent.

Because people are not only buoyant on the earth, but also by the earth's gravity, which is much greater than buoyancy, it is said that people still can't fly.

Because the buoyancy of a person in the air is less than the attraction of the earth to a person (the gravitational force of a person), the person does not fly.

Because the density of the air is so small, the buoyancy of people is almost negligible, just like the denser objects will sink in the water

Man is also affected by the gravitational pull of the earth, and if the gravitational acceleration g of the earth becomes smaller, we may be able to fly like we do on the moon or on alien planets.

The buoyancy force is too small (compared to gravity) to provide upward acceleration.

Your density is too great to go up.

The minimum requirement for an object to float is that the buoyancy is greater than the gravitational force exerted.