Explore our collection of educational resources to learn about different measurement units and their applications.
Electric charge is a fundamental property of matter that causes it to experience a force when placed in an electromagnetic field. It is a conserved property of subatomic particles.
Torque is a measure of the force that can cause an object to rotate about an axis. It is a vector quantity, meaning it has both magnitude and direction.
Digital memory refers to computer components and recording media that retain digital data used for computing for some interval of time.
Luminous flux measures the total quantity of visible light emitted by a source per unit time, weighted according to the human eye's sensitivity to different wavelengths.
Sound is a vibration that propagates as an acoustic wave through a transmission medium such as a gas, liquid, or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain.
Electric current is the flow of electric charge through a conductor. It is one of the most fundamental concepts in electricity and electronics, essential for powering modern technology.
Rotational speed refers to the number of complete turns a rotating object makes per unit of time. It is a fundamental concept in mechanical and electrical engineering.
The rate of an enzyme-catalyzed reaction is a measure of how quickly a substrate is converted to product by an enzyme. This is fundamental to biochemistry and molecular biology.
Flow rate measures the volume of fluid that passes through a given surface per unit time. It is crucial in fluid dynamics, engineering, and various industrial applications.
Piece count is a fundamental unit of quantity used in various fields such as manufacturing, inventory management, and commerce. It represents discrete, countable items.
Electric potential, also called voltage, is the amount of electric potential energy per unit charge at a point in an electric field. It is a scalar quantity measured in volts.
An angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex. Angles are fundamental in geometry, physics, and engineering.
Electromagnetic quantities describe various aspects of electric and magnetic fields and their interactions with matter. These are fundamental to understanding electricity, magnetism, and light.
Length is the measure of distance between two points. It is one of the most fundamental measurements in science and daily life, forming the basis for geometry, physics, and countless practical applications.
Mass is the measure of the amount of matter in a physical body. Unlike weight, which is the force of gravity on an object, mass is constant regardless of location. It is a fundamental property of matter.
Temperature is a measure of the average kinetic energy of the particles in a substance. It determines the direction of heat flow between two objects in thermal contact. It is a critical parameter in science, industry, and daily life.
Area is the measure of a two-dimensional space. It quantifies the extent of a shape or surface. Understanding area is crucial in fields like agriculture, construction, and urban planning.
Volume is the measure of three-dimensional space occupied by a substance or object. Capacity, a closely related term, refers to the amount a container can hold. These concepts are vital in cooking, engineering, and logistics.
Speed is the rate at which an object covers distance. It is a scalar quantity, meaning it only has magnitude and not direction (which would be velocity). Speed is fundamental to physics, transportation, and communication.
Digital storage measures the capacity of a digital device or medium to store data. It is based on the binary system, where the fundamental unit is the bit, representing a 0 or 1.
Time is a fundamental concept, describing the sequence of events from the past through the present to the future. It is a dimension in which events can be ordered, and the duration of events and the intervals between them can be measured.
Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. It is a critical concept in physics, engineering, and meteorology.
In physics, power is the rate at which energy is transferred or converted. It is the amount of energy consumed per unit time. Understanding power is essential for electrical engineering, mechanics, and everyday energy consumption.
Energy is the quantitative property that must be transferred to an object in order to perform work on, or to heat, the object. It is a conserved quantity; the law of conservation of energy states that energy can be converted in form, but not created or destroyed.
Voltage, also known as electric potential difference, is the pressure from an electrical circuit's power source that pushes charged electrons (current) through a conducting loop. It is the work needed per unit of charge to move a test charge between two points.
Electric current is the rate of flow of electric charge past a point or region. An electric current is said to exist when there is a net flow of electric charge through a region. In electric circuits, this charge is often carried by moving electrons in a wire.
Frequency is the number of occurrences of a repeating event per unit of time. In physics, it is used to describe oscillations and waves, such as sound, light, and alternating current.
Illuminance is the total luminous flux incident on a surface, per unit area. It is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with human brightness perception.