The word weight is mainly used to refer to the force or energy with which a body is brought closer to the Earth. However, this word has several meanings, among which it refers to the object or scale that is used to weigh something in particular; Likewise, objects that are used to compensate or stabilize the magnitude, measurement or to exert some type of pressure on an object that you want to balance are qualified as “weight”. It also refers to a type of currency used in various countries.

what is weight

It is defined as the magnitude that measures the force with which gravity presses or attracts a body towards the earth or a star. This means that it measures the force exerted in the gravity field of a planet or star on the bodies that are attracted to it.

Because it is a force, weight is symbolized as a vector that is a physical magnitude defined by a point in space in which said magnitude is measured, as well as a module or extension, its direction or orientation and its sense where the weight differs. origin of the end applying to the center of gravity of the body and directed approximately towards the center of the earth.

On the earth’s surface, this is not only the result of calculating the force exerted on the center of gravity of the body towards the center of the earth, but also the centrifugal force due to the rotational movement of the planet must be taken into account. The unit of measurement of this magnitude is Newton according to the International System.

The term is also used to refer to a currency that circulates in several countries, such as Mexico, Colombia, Chile, Uruguay, Cuba, the Dominican Republic or Argentina. The etymology of the term comes from the Latin pensum, which in turn derives from the verb pendere, which translates as “to hang” or “to hang”.

Weight Characteristics


  • It is a vector force, which is defined by the gravitational field of the star and the center of gravity of the object or body on which the force is exerted.
  • It is drawn towards approximately the center of the earth.
  • It is not determined by the mass of a body, because they are different concepts.
  • It is not uniform throughout the earth’s surface; it is subject to the altitude and latitude in which the body is located.
  • This generates the fall of bodies and their acceleration.
  • The atomic weight is the value in weight that each element has with respect to the twelfth part of the mass of a carbon-12-atom.
  • The molecular weight, on the other hand, is the sum of the atomic weights existing in the atoms that make up a molecule.

weight units

Because it is defined as a force, its unit of measurement is expressed in force measurements. In this case, according to the International System of Units, the Newton is its unit. This was named in this way thanks to the contributions made by the scientist Sir Isaac Newton to the field of physics, and is defined as the amount of force that is applied during a period of 1 second to a mass equivalent to 1 kilogram so that it is produce the speed of 1 meter per second.

Formula for calculating weight

The formula to calculate it is given by:


Taking into account that F represents the force exerted by the weight, m ​​is the mass of the body and g is the value of the acceleration due to gravity.

Specific weight

In chemistry and physics it is the relationship between the weight and the volume that a substance occupies. The unit of measure used to measure it is the Newton per cubic meter; however, other scientific agencies around the world use the kilopond over cubic meter. The first unit belongs to the SI that is applied in the American continent and the second to the Technical System of Units.

There is a dilemma in what it represents, because for some the specific weight is what determines the density, while for others it is what a substance occupies in a space, and different calculations are applied in chemistry and physics. Its formula is as follows:


where is the specific weight, w is the weight, V is its volume, m is its mass, g is the acceleration due to gravity, and density.

human body weight


From a medical point of view and although it is not definitive, weight is an important indicator of a person’s health. The excess of it can reveal overweight and multiple complications in the health of a person, as well as its deficit.

For example, a person with excessive obesity can suffer from heart, respiratory, metabolic diseases and complications, high levels of cholesterol and blood sugar, cancer and even sleep disorders.

In the opposite case, a low weight can indicate malnutrition, anorexia, failures in the assimilation of vitamins and other elements necessary for the optimal functioning of the organism.

ideal weight

Although the ideal frame is relative, there is a formula to indicate the “healthy” range in an individual, called Body Mass Index (BMI). To calculate ideal weight, there is the following formula:

Being the mass expressed in kilograms and the height in meters. From the figure obtained, below 18.5 means that the person is underweight, the normal range is between 18.5 and 25, and above 25 is considered obese.

However, there is no exact rule as far as the ideal weight is concerned, as this method is not exact since it depends on other factors. Even the ideal will depend on how comfortable a person feels about it; there are those who perform countless exercises to lose weight, but accepting your own body is important, as this will affirm your self-esteem regardless of what a scale indicates.

weight loss methods

To achieve the ideal frame according to the medical point of view according to the indicator mentioned above, several strategies can be taken into account, both to win it and to lose it:

  • Multiple exercise routines can be practiced to lose weight, such as sets of push-ups, squats, sit-ups, deadlifts, and running.
  • Eat smoothies to lose weight, such as green cucumber, apple, kiwi and celery.
  • Among other juices to lose weight, there are those of pineapple, lemon, grapefruit and aloe vera.
  • The exercises must be complemented with a balanced diet, do without carbohydrates, fats and sugars and prepare recipes to lose weight, which can be obtained online.

Difference Between Mass and Weight

Both concepts have often led to confusion, since it has been popularly believed that weight is measured in kilograms. But it must be established that this is measured and expressed in units of force, since it is defined as the force exerted on a body and this is subject to the gravity to which it is subjected: if there is no gravity, there is no weight.

On the other hand, mass is the amount of matter in a body, which will remain unchanged regardless of the force of gravity that is exerted on it.

Similarly, the units and devices in which they are measured are different: while mass is measured in kilograms and on a scale, weight is measured in Newtons or in kilograms of force and is measured with a dynamometer.

Frequently Asked Questions about Weight

Who invented the weight?

The first to reflect on this concept and led him to the discovery of the Law of Universal Gravitation, the result of his observations on the fall of bodies on Earth.

How to lose weight quickly?

There are several methods that combined can achieve rapid weight loss, for example: eliminate the consumption of sugars and carbohydrates, eat foods rich in fiber, walk and do exercises to lose weight in the abdomen, drink enough water and green tea, sleep the amount of adequate hours and exercise with weights.

How much does the earth weigh?

The total weight of planet Earth is 5,936 x 1024 kilograms, which would be more like its mass.

How is the ideal weight of a person calculated?

It is calculated through the Body Mass Index (BMI) formula, dividing the person’s mass (expressed in kilograms) by height (expressed in meters) squared. From the resulting figure, the normal range is between 18.5 and 25, below it indicates malnutrition and above, obesity.

What is the difference between mass and weight?

While mass refers to the amount of matter in a body regardless of whether there is gravity exerting force on it; weight is the action exerted by gravity on it, so in its absence, weight will not exist.