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Glossary Library

The glossary page provides a comprehensive collection of key terms and definitions across Physics, Chemistry, and Engineering, offering quick access to essential concepts. It serves as a valuable resource for students and professionals seeking to deepen their understanding of these disciplines.

PHYSICS

Force

A push or pull acting upon an object.

Velocity

The rate of change of an object's position with time.

Acceleration

The rate of change of velocity with time.

Momentum

The product of an object's mass and velocity.

Work

The energy transferred by a force over a distance.

Power

The rate at which work is done.

Energy

The capacity to do work or produce change.

Thermodynamics

The study of heat, work, and energy.

Entropy

A measure of disorder or randomness in a system.

Newton's Laws

Three fundamental laws describing motion and forces.

Kinetic Energy

The energy an object has due to its motion.

Potential Energy

The energy an object has due to its position or configuration.

Friction

The resistance to motion of two surfaces in contact.

Gravitational Force

The force of attraction between two masses.

Electromagnetic Waves

Waves of electric and magnetic fields that propagate through space.

Refraction

The bending of light as it passes from one medium to another.

Reflection

The bouncing back of light or sound waves from a surface.

Diffraction

The bending of waves around obstacles or through openings.

Interference

The superposition of two or more waves resulting in a new wave pattern.

Polarization

The orientation of oscillations in a wave, especially light waves.

Coulomb's Law

The force between two charged objects is proportional to their charges and inversely proportional to the square of the distance between them.

Electric Field

A field around charged particles that exerts a force on other charges.

Magnetic Field

A field produced by moving charges or magnetic materials.

Ohm's Law

The current through a conductor is proportional to the voltage across it and inversely proportional to its resistance.

Resonance

The increase in amplitude of a vibration when a system is driven at its natural frequency.

Capacitance

The ability of a system to store an electric charge.

Inductance

The property of a conductor to oppose a change in current.

Photoelectric Effect

The emission of electrons from a material when light shines on it.

Quantum Mechanics

The study of particles on an atomic and subatomic scale.

Superposition

The principle that a particle can exist in multiple states simultaneously.

Wave-Particle Duality

The concept that particles exhibit both wave and particle properties.

Uncertainty Principle

The principle that the position and momentum of a particle cannot both be precisely determined at the same time.

Relativity

Einstein's theory describing the relationships between space, time, and gravity.

Black Hole

A region in space where gravity is so strong that nothing, not even light, can escape.

Doppler Effect

The change in frequency or wavelength of a wave in relation to an observer moving relative to the source.

Radiation

The emission of energy as electromagnetic waves or particles.

Nuclear Fission

The process of splitting a nucleus into smaller parts, releasing energy.

Nuclear Fusion

The process of combining smaller nuclei to form a larger nucleus, releasing energy.

Higgs Boson

A particle associated with the Higgs field, which gives particles mass.

Dark Matter

A form of matter that does not emit or interact with electromagnetic radiation, making it invisible.

CHEMISTRY

Acid

A substance that increases the hydrogen ion concentration in a solution.

Base

A substance that decreases the hydrogen ion concentration in a solution.

Atom

The smallest unit of matter that retains the properties of an element.

Molecule

A group of atoms bonded together, representing the smallest unit of a chemical compound.

Ion

An atom or molecule with a net electric charge due to the loss or gain of electrons.

Isotope

Atoms of the same element with different numbers of neutrons.

Covalent Bond

A bond formed when atoms share electrons.

Ionic Bond

A bond formed by the electrostatic attraction between oppositely charged ions.

Electronegativity

A measure of an atom's ability to attract electrons in a bond.

Periodic Table

A chart of the elements arranged by atomic number, electron configuration, and recurring chemical properties.

Avogadro's Number

The number of particles in one mole of a substance, approximately 6.022 × 10^23.

Mole

The amount of substance that contains as many particles as there are atoms in 12 grams of carbon-12.

Chemical Reaction

A process in which substances are transformed into different substances.

Catalyst

A substance that increases the rate of a chemical reaction without being consumed.

Activation Energy

The minimum energy required to initiate a chemical reaction.

Oxidation

The loss of electrons in a chemical reaction.

Reduction

The gain of electrons in a chemical reaction.

pH

A scale used to measure the acidity or basicity of a solution.

Solvent

The substance that dissolves a solute to form a solution.

Solute

The substance dissolved in a solvent to form a solution.

Hydrocarbon

Compounds composed of only carbon and hydrogen atoms.

Allotrope

Different structural forms of the same element in the same physical state.

Organic Chemistry

The study of carbon-containing compounds and their properties.

Inorganic Chemistry

The study of non-carbon-containing compounds and their properties.

Electrolysis

The process of using electricity to break a compound into its components.

Chemical Equilibrium

The state in which the concentrations of reactants and products remain constant over time.

Buffer

A solution that resists changes in pH when small amounts of acid or base are added.

Sublimation

The direct transition of a substance from a solid to a gas without passing through the liquid phase.

Deposition

The direct transition of a substance from a gas to a solid without passing through the liquid phase.

Enthalpy

The heat content of a system at constant pressure.

Entropy

A measure of the disorder or randomness in a system.

Le Chatelier's Principle

The principle that a system at equilibrium will adjust to counteract changes in conditions.

Valence Electrons

Electrons in the outermost energy level of an atom, involved in bonding.

Polarity

The distribution of electrical charge over the atoms joined by a bond.

Amphoteric

A substance that can act as both an acid and a base.

Precipitate

An insoluble solid formed during a chemical reaction in a solution.

Endothermic Reaction

A reaction that absorbs heat from its surroundings.

Exothermic Reaction

A reaction that releases heat to its surroundings.

Titration

A technique to determine the concentration of a solute in a solution.

Atomic Number

The number of protons in the nucleus of an atom.

Atomic Mass

The weighted average mass of the atoms of an element.

Radioactivity

The spontaneous emission of radiation by an unstable atomic nucleus.

Half-Life

The time required for half of the radioactive nuclei in a sample to decay.

Chelation

The process of forming a complex between a metal ion and a large molecule with multiple bonds.

Lattice Energy

The energy required to separate a mole of an ionic solid into gaseous ions.

Avogadro's Law

The volume of a gas is directly proportional to the number of moles of gas at constant temperature and pressure.

ENGINEERING

Actuator

A device that converts energy into motion.

Adhesion

The property of materials to stick to other surfaces.

Aerodynamics

The study of how air flows around objects.

Alloy

A mixture of two or more metals to create a new material.

Bearing

A machine element that allows constrained motion with minimal friction.

Beam

A structural element that primarily resists bending.

CAD

Software used for creating detailed 2D or 3D designs.

Compressive Strength

The ability of a material to withstand compression.

Corrosion

The degradation of metals due to environmental factors.

Elasticity

The ability of a material to return to its original shape after deformation.

Entropy

A measure of disorder in a thermodynamic system.

Fatigue

The weakening of a material caused by repetitive stress over time.

Fluid Dynamics

The study of fluids in motion.

Gear Ratio

The ratio between the number of teeth on two meshing gears.

Heat Exchanger

A device used to transfer heat between two or more fluids.

Kinematics

The study of motion without considering forces.

Load Factor

The ratio of applied load to the safe load limit.

Machining

A process of shaping materials by removing unwanted material.

Moment of Inertia

A measure of an object's resistance to rotational motion.

Nanotechnology

Engineering at the scale of atoms and molecules.

Nozzle

A device designed to control the flow of a fluid.

Orthogonal Cutting

A machining process where the cutting edge is perpendicular to the tool.

Piping

A network of pipes used to transport fluids or gases.

Plasticity

The property of a material to undergo permanent deformation.

Reinforced Concrete

Concrete embedded with steel bars for added strength.

Resilience

The ability of a material to absorb energy and return to its shape.

Shear Stress

A force that causes layers of material to slide against each other.

Stiffness

The rigidity of an object and its ability to resist deformation.

Strain

The deformation of a material due to applied stress.

Stress

The internal force per unit area within a material.

Surface Tension

The elastic tendency of a fluid surface to minimize its area.

Tensile Strength

The resistance of a material to breaking under tension.

Thermal Expansion

The increase in size of a material when heated.

Torque

A rotational force that causes an object to rotate.

Turbulence

Irregular fluid flow characterized by vortices and eddies.

Valve

A device that regulates fluid flow in a system.

Viscosity

A measure of a fluid's resistance to flow.

Welding

A process of joining materials, usually metals, by melting and fusing them.

Yield Strength

The stress at which a material begins to deform plastically.

Zener Diode

A semiconductor device that allows current to flow in reverse under specific conditions.

Thermodynamics

The study of heat, work, and energy in systems.

Circuit Breaker

A safety device that interrupts excessive current flow.

Insulation

Material used to reduce heat transfer or sound transmission.

Buoyancy

The force that causes objects to float in a fluid.

Efficiency

The ratio of useful work output to total energy input.

Friction

The resistance to motion between two surfaces in contact.

Radiation

The transfer of energy as electromagnetic waves.

Additive Manufacturing

The process of creating objects by adding material layer by layer (e.g., 3D printing).

Anisotropy

The property of being directionally dependent.

Creep

The slow deformation of a material under constant stress over time.

Fluidization

The process of converting a solid into a fluid-like state by passing a gas or liquid through it.

Mechatronics

An interdisciplinary field combining mechanical, electrical, and software engineering.

Redundancy

The inclusion of extra components in a system for reliability.

Finite Element Analysis (FEA)

A computational technique used to predict how structures respond to forces and stresses.

Crystallography

The study of crystal structures and their properties.

Piezoelectricity

The property of certain materials to generate an electric charge when mechanically stressed.

Stress Concentration

The accumulation of stress in a localized area of a material.

Factor of Safety

The ratio of the maximum load a structure can handle to its intended load.

Thermal Conductivity

The ability of a material to conduct heat.