One kilogram of cotton or one kilogram of iron, which one weighs?

The usual answer to this question is: as heavy!

But if you dig deeper, you may have a different answer.

If a kilogram of cotton and a kilogram of iron are weighed in the air, then their weight in a vacuum, cotton is heavier. Because the volume of one kilogram of cotton is greater than the volume of one kilogram of iron, the buoyancy of one kilogram of cotton in the air is slightly larger, and then they are weighed in a vacuum, without the influence of air buoyancy, the weight of cotton will be slightly heavier.

If a kilogram of cotton and a kilogram of iron are weighed in a vacuum, then the iron will be slightly heavier when they are weighed in the air.

Also, different locations can also affect weighing results.

A kilogram of cotton and a kilogram of iron weigh the same. Because they are both one kilogram, many people will think that iron will be a little heavier, but they are all one kilogram, so they are the same weight, the difference is that a kilogram of cotton is estimated to be a lot, but a kilogram of iron may be a little smaller than the volume of a kilogram of cotton, but no matter what, they weigh the same.

One kilogram of cotton and one kilogram of iron weigh equally, i.e., the weight is equal.

One kilogram of cotton and one kilogram of iron, both of which weigh the same amount are one kilogram.

The volume of one kilogram of cotton is larger than that of one kilogram of iron.

The same weight, both are one kilogram.

Both are one kilogram, so they are the same weight!

1 kilogram of cotton weighs as much as 1 kilogram of iron, both are one kilogram.

Because they all weigh a kilogram. It's just that the substance is different, the density of iron is very large, and the density of cotton is very small, so the volume of one kilogram of iron is much smaller than the volume of one kilogram of cotton. Because the air is buoyant, the iron volume is small, and the buoyancy is also small, so it feels that the iron is a little heavier when you put it in your hand, and the cotton is large, the force area is large, and the pressure is small, so it feels light when you hold it.

The kilogram is the basic unit of mass in the International System of Units, and the kilogram is also one of the most commonly used basic units in everyday life. A kilogram is defined as a unit of mass when Planck's constant lasts, almost as much as a liter of water. And the kilogram is the only basic unit with an SI prefix.

It must be the same, but it is only because of people's impression of these two that some people think that iron is heavier than cotton, even if the weight is the same.

All weigh the same as 1 kg. Converted according to weight units: 1 kg = 1000 grams; 1 kg = 1 kg.

It can be seen that the weight of 1 kilogram of cotton and 1000 grams of iron is equal, so 1 kilogram of cotton and 1000 grams of iron are the same weight, and it is wrong to say that iron is heavier.

Problem-solving skills: This question mainly tests the understanding of test points such as "conversion between weight units". In daily life, iron is felt heavier because iron is denser, and the same mass of iron is smaller. Since the air is buoyant, the iron is small in size and has little buoyancy, so it feels a little heavier when you put it in your hand.

Cotton has a large volume, a large force area, and a small pressure, so it feels light when you hold it.

The kilogram (symbol kg) is the basic unit of measurement of mass in the International System of Units, and the kilogram is also one of the most commonly used basic units in daily life. One kilogram is defined as the mass of the international kilogram prototype, which is almost the same weight as one liter of water. The kilogram is the only base unit with an SI prefix, and the only SI unit that still uses artifacts as its definition (all other units are defined by basic physical properties to facilitate replication in different laboratories).

A pound of iron and a pound of cotton, the net content is the same, however, the volume they occupy is very different.

If you put a pound of cotton and a pound of iron on the scale, you will find that it is actually a pound of iron. Because, iron is small in size, f = pvg, buoyancy = density * volume * gravity.

Obviously, if you don't count air, the density * volume of iron and the density * volume of cotton are the same, both are one catty.

But count the air! Therefore, the volume of cotton is much larger than that of iron, and therefore, the air buoyancy is much greater than that of iron!

And! The question asks "who is heavy" rather than whose "quality" is big! Therefore, it is really about weight rather than quality.

Therefore, iron is heavier than cotton.

1 kilogram of iron is (the same) weight compared to 1000 grams of cotton.

Iron and cotton have different densities, so they have different volumes.

1 kilogram of iron is the same weight as 1000 grams of cotton.

1 kilogram of iron weighs as much as cotton.

1000 grams is equal to 1 kilogram, and 1 kilogram is equal to 1 kilogram.

Converted according to weight units: 1 kg = 1000 grams; 1 kg = 1 kg. It can be seen that 1 kilogram of cotton and 1000 grams of iron are equal in weight, so 1 kilogram of cotton and 1000 grams of iron are the same weight, and the answer is that iron is heavier is wrong.

In science and engineering, the weight of an object usually refers to the force that gravity exerts on it. Weight is a vector quantity, and its quantity (scalar) is generally indicated in italics. Weight is the product of mass and acceleration due to local gravity, i.e.,

w=mg。The unit of measurement of gravity is the same as force, which is the "newton" of the International System of Units.

For example, an object with a mass of one kilogram weighs a newton on the Earth's surface and one-sixth the newton on the Moon. According to this definition, for an object to be weightless, in principle it is only possible to move infinitely away from all other objects with mass.

Although weight and mass are scientifically different quantities, they are often used interchangeably in everyday life. Such as converting or comparing force in pounds and mass in kilograms and vice versa.

Newtonian physics and engineering also had a tradition of treating the weight of an object as its weight. Here the weight is the reaction force exerted on a thing.

In general, when measuring the weight of an object, the object is placed on a scale that is at rest relative to the Earth, and this definition can be extended to other states of motion.

Therefore, the weight of the object in free fall is zero. This second definition of weight allows an object on the ground to be weightless. Ignoring air resistance, Isaac Newton's famous apple has no weight until it falls from the tree and touches the ground.

Also, according to the theory of relativity, gravity is the result of the curvature of space-time. The teaching community has been debating "how to define weight to students" for more than half a century. The current situation is one in which multiple concepts coexist, and different concepts are used depending on the situation.

Of course, it is the same weight, but the density of cotton is small, so the volume is large, and the density of iron is large, so the volume is small.

Parsing process——

The mass of cotton is 1000 grams, and the mass of iron is also 1000 grams 1000-1000=0, which shows that the quality of the two is the same.

As long as they have the same mass, regardless of the size of the two, the weight of both is the same.