The magnitudes can vary according to the scale. In general, this property helps us to perform calculations on these materials, with this we can carry out experimental practices.
There are two types of quantities: scalar and vector.
Examples of quantities
- Length. It is used to calculate the dimension of an object according to its extension in a straight line. The unit of measurement used in the International System of Units (SIU) is the meter (m). From there it is derived: millimeters (mm), centimeters (cm), kilometers (km), hectometer (hm), decimeter (dm) and decameters (dam).
- Mass. It is the amount of matter in a body. The unit of grams (g) is generally used. From there it derives: kilograms (kg), hectogram (hg), decagram (dag), decigram (dg), centigram (cg) and milligrams (mg).
- Weather. It is normally measured in seconds, minutes, and hours. Days, weeks, months, quarters, semesters, years, biennia, triennia, lustrums, decades, centuries, millennia are also included.
- Temperature. It is a physical quantity that measures the amount of heat or cold of an object or the environment. The unit of measurement is degrees Celsius, degrees Fahrenheit, or degrees Kelvin. Each of these systems have their equivalent in another.
- Electric current. It measures the flow of electrical charge that an object or body contains at a given moment. The unit of measurement used for electrical current is the ampere (A).
- Luminous intensity. Represents the luminous flux in a particular direction. The unit of measurement is the candela (cd), although the word “brightness” is used commercially.
- Amount of substance . It has to do with the amount of molecules contained in the masses or volumes. The unit of measurement used is the mole.
- Pressure. Measures the force in a perpendicular direction per unit area, such as ambient pressure. Pascal is the unit of pressure (Pa or P).
- Energy. Energy is the capacity that some bodies have and that is responsible for modifying their chemical or physical composition, in addition to that of other bodies. The unit of measurement used is joules (J).
- Volume . It measures the three-dimensional space occupied by a body. The commonly used unit is the cubic meter (m³).
- Frequency. Frequency is the number of times a phenomenon or event occurs in a given period of time. The unit of measurement is Hertz (Hz).
- Density. It is the relationship that exists between the mass of a body and the volume it occupies. Its unit of measurement can be kilograms per cubic meter (kg / m³).
- Velocity. It is the relationship that exists between the displacement and displacement time of a body. Units of measurement can be kilometers per hour (km / h), meters per second (m / sec), or mile per hour.
- Acceleration. Defines the change in the speed of an object, either to calculate if the speed has decreased or increased. The unit used is the meter over second squared (m / s 2 ).
- Force. It denotes the work applied to a body to be able to carry out its movement. The most common unit is the newton (N).
- Power. It is expressed in watts or watts (W).
- Electric field. It is expressed with the letter E and its unit is N / C, that is, force on load. It is used to measure the pressure that exists between electrically charged bodies that are separated or brought closer to each other.
- Displacement. Denotes the distance and direction of the final position from the initial position of an object. The unit is (Δd).
- Weight. It is the relationship between the mass of a body and the Earth’s force of gravity. It is calculated in Newton and their common unit is the kilopond (kp) and kilogram-force (kgf).
- Thermal energy. It is the manifestation of energy in the form of heat. Thermal energy is expressed in calories (Cal) or kilocalories (Kcal).
- Gravitational field. It is the force field that is related to gravity. It is expressed in mass over force (m / F)
- Impulse. Represents the variation in motion in a straight line that a body experiences in a closed system. It is expressed in kg xm / s
- Other vector quantities are: Momentum, torque and magnetic field