Mass The quantity of matter in an object

Mass is related to weight, but the two are not identical. Mass measures the quantity of matter in an object. As long as the object is not changed, it will have the same mass, no matter where it is in the universe. On the other hand, the weight of that object is affected by its location in the universe. The weight depends on gravity, while mass does not. 

Mass describes the quantity of matter in an object. The terms weight and mass, in common usage, are often considered synonymous. They are not, in fact. Weight is the force of gravity on an object ... 

Mass describes the quantity of matter in an object. In SI the standard of mass is 1 kilogram (kg), which is a fairly large unit for most applications in chemistry. More commonly we use the unit gram (g). 

The mass of an object represents the quantity of matter in that object. 

The concept of mass is central to the discussion of matter and energy. The mass of an object depends on the quantity of matter in the object. The more mass the object has, the harder it is to set into motion and the harder it is to change its velocity once it is in motion. 

Variations in the Force Due to Gravity. The mass of an object is the quantity of matter in the object. It is a fundamental quantity that is fixed, and does not change with time, temperature, location, etc. The standard for mass is a platinum—iridium cylinder, called the International Kilogram, maintained at the International Bureau of Weights and Measures, in Siivres, France. The mass of this cylinder is 1 kg by definition (9). All national mass standards are traceable to this artifact standard. 

Matter is anything that has mass and occupies space. Mass is a measure of the quantity of matter in a sample of any material. The more massive an object is, the more force is required to put it in motion. All bodies consist of matter. Our senses of sight and touch usually tell us that an object occupies space. In the case of colorless, odorless, tasteless gases (such as air), our senses may fail us. 

Mass The quantity of matter an object contains is its mass. The SI unit of mass is the kilogram (kg), the only base unit whose standard is an object—a platinum-iridium cyhnder kept in France— and the only one whose name has a prefix. ... 

The density of a substance is commonly calculated in chemistry. The density (D) of an object is calculated by dividing the mass of the object by its volume. (Some authors will use a lowercase d to represent the density term be prepared for either.) Since density is independent of the quantity of matter (a big piece of gold and a little piece have the same density), it can be used for identification purposes. The most common units for density in chemistry are g/cm3 or g/mL. 

Defining the mass of an object as the quantity of matter it possesses is not a very good scientific definition. A better one can be found in N vton s second law of motion. If a constant force is applied to an object on a frictionless, horizontal surface, the object accelerates—its velocity increases uniformly with time. If a force twice as large is applied to the same object, its acceleration doubles as well. The object s acceleration is proportional to the force applied to it. We might write Fa a where F is the force applied to the object and a is the acceleration of the object while the force acts. The symbol a means that the two quantities, force and acceleration, are proportional that is, if the force doubles the acceleration doubles. 

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