Twig Secondary

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A
- Absolute zero
- Absorption
- Accuracy
- Acid
- Acid rain
- Activation energy
- Adaptive divergence
- Addiction
- Aerobic respiration
- Aerosol
- Agar
- Alcohol
- Algae
- Alkali
- Alkali metal
- Alkaline earth metal
- Allele Glossary video
- Allotropes
- Alloy
- Alpha particle
- Altitude Glossary video
- Alveoli Glossary video
- Amino acid
- Amniotic fluid
- Amorphous
- Amplification of DNA
- Amplify
- Amplitude Glossary video
- Amylase
- Anaerobic respiration
- Analog
- Angiosperm
- Angle of incidence
- Angle of reflection
- Angstrom
- Anode
- Antagonistic muscles
- Antenna
- Antibiotic
- Antibiotic resistance
- Antibody
- Anticyclone
- Antigen
- Antimatter
- Antioxidant
- Aorta
- Apoptosis
- Appendix
- Aqueous
- Aquifer
- Archaea
- Artificial propagation
- Asexual Reproduction Glossary video
- Asteroid
- Astronomy
- Atmosphere Glossary video
- Atom
- Atomic mass
- Atomic number
- Atomic weight
- ATP
- Aurora
- Autoimmune disease
- Autosomal
- Autotroph
- Auxin
- Axon Glossary video
B
- Bacteria Glossary video
- Baryons
- Basalt
- Base (biology)
- Base (chemistry)
- Big Bang
- Bile
- Billion
- Biochemistry
- Biodegradable
- Biodiversity
- Biomass
- Biosphere Glossary video
- Black hole
- Blastocyst
- Blood pressure
- Boiling point
- Boyle's law
- Brittle
- Bronchi Glossary video
- Bronchiole Glossary video
- Buffer
- Bunsen burner
- Buoyancy
C
- Caldera
- Calibrate
- Carbohydrate
- Carbon dating
- Carbonate
- Carpel
- Catabolism
- Catalyst
- Cathode
- Cathode ray
- Cell cycle
- Cell division
- Cell Glossary video
- Cell wall
- Cellulose
- Cervix
- Chemical bond
- Chemical energy
- Chemical reaction
- Chemical synthesis
- Chemiluminescence
- Chlorofluorocarbons
- Chlorophyll
- Chloroplast
- Chordate
- Chromatin
- Chromosome
- Classification
- Climate
- Climatology
- Clone
- Coke
- Combustion
- Comet
- Compound
- Compound microscope
- Concave
- Concentration
- Conception
- Condensing
- Conduction
- Continental crust
- Continental Drift Glossary video
- Control
- Convection Glossary video
- Convex
- Core (biology)
- Core (Earth sciences)
- Corona
- Correlation video
- Corrosion
- Cortisol
- Cosmic dust
- Cosmic rays
- Cosmology
- Coulomb
- Covalent bond
- Crater Glossary Video
- Crude oil
- Crust
- Crystal
- Crystallization
- Cytoplasm
D
- Dark energy
- Dark matter
- Data
- Decomposition
- Delocalized electrons
- Delta
- Denature
- Denitrification
- Density
- Deoxygenated Glossary video
- Depression
- Desertification
- Diabetes
- Diatomic
- Diffraction
- Diffusion
- Digestion
- Diode
- Diploid
- Dissociate
- Dissolve
- Distillation
- Divergence
- DNA
- DNA profile
- DNA replication
- Dominant Allele Glossary video
- Doppler shift
E
- Earth
- Earthquake
- Echo
- Echolocation Glossary video
- Ecosystem
- Elastic
- Electric Current
- Electric force
- Electrical charge
- Electrode
- Electrolysis
- Electrolyte
- Electrolytic cell
- Electromagnetic radiation
- Electromagnetic Spectrum Glossary video
- Electron
- Electron shell
- Electrostatic attraction
- Element
- Elliptical orbit
- Embryo
- Emission
- Endangered Glossary video
- Endocytosis
- Endothermic Glossary video
- Energy Glossary video
- Energy level
- E-Number
- Enzyme
- Epicenter
- Epidemiology
- Epinephrine
- Equilibrium
- Erosion
- Eukaryote
- Evaporation
- Evolution Glossary video
- Exothermic Glossary video
- Extinction
- Extraction
- Extrusion
F
- Fahrenheit (°F)
- Fatty acid
- Fermentation
- Fertilization
- Fetus
- Filtration
- Flammable
- Floodplain
- Fluorescent
- Focus
- Food Chain Glossary video
- Force Glossary video
- Forensic science
- Formulae
- Fossil Fuels Glossary video
- Fossil Glossary video
- Frequency Glossary video
G
- Galaxy
- Gamete
- Gamma ray
- Gamma ray bursts
- Gas
- Gene Glossary video
- Genotype Glossary video
- Genus
- Germination
- Glacial period
- Gland
- Glucose Glossary video
- Gravitational field
- Gravity
- Greenhouse effect
- Greenhouse Gas Glossary video
- Groundwater Glossary video
H
- Hale-Bopp
- Half-life
- Halley
- Haploid
- Harmonics
- Heat Glossary video
- Heat resistant
- Hemoglobin
- Hertz (Hz)
- Heterogeneous mixture
- Homogeneous mixture
- Hormones
- Hot spot
- Hybridization
- Hydrocarbons
- Hydrophilic
- Hydrophobic
- Hydroxide
- Hyperventilating
- Hypothalamus
- Hypothesis
I
- Igneous Rock Glossary video
- Indicator
- Inert
- Infectious
- Infrared light
- Infrasound
- Inherited
- Insoluble
- Insulator
- Interference
- Interglacial period
- Intermolecular force
- Invertebrate
- Involuntary
- Ion
- Ionic bond
- Ionic compound
- Ionization
- Irritant
- Isomers
- Isotope
K
- Kilohertz
- Kinetic Energy Glossary video
L
- Laser
- Lattice
- Launch window
- Leaching
- Lens
- Light year (ly)
- Lightning
- Limestone
- Line spectra
- Linnaean hierarchy
- Lipids
- Liquid
- Lithosphere
- Longitudinal wave
- Long-period events
- Luminance
- Lunar Eclipse Glossary video
- Lymphocyte
M
- Magma
- Magnetic Field Glossary video
- Magnetic force
- Mantle
- Mass Glossary video
- Mass spectrometer
- Matter
- Mean
- Mechanical Wave Glossary video
- Median
- Medium
- Meiosis
- Melting point
- Mesosphere
- Metabolism
- Metal
- Metallic bond
- Metalloid
- Metamorphic Rock Glossary video
- Metamorphism
- Meteor
- Meteor shower
- Meteorite
- Methane
- Microorganism Glossary video
- Microwave
- Migration
- Milky Way
- Millibar (mb)
- Mineral (biology)
- Mineral (chemistry)
- Mitosis
- Modulation
- Molecular mass
- Molecular weight
- Molecule
- Molten
- Monomer
- Moon
- Motion
- Mutation Glossary video
- Myoglobin
N
- Nanomaterial
- Nanometer
- Nanotechnology
- Nebula
- Negative charge
- Neutral
- Neutralization
- Neutron
- Neutron star
- Noble gases
- Nonflammable
- Nonmetals
- Normal
- Nova
- Nuclear
- Nuclear fission
- Nuclear fusion
- Nucleation
- Nucleic acid
- Nucleosynthesis
- Nucleus (biology)
- Nucleus (chemistry)
- Nutritional value
O
- Observer
- Oceanic crust
- Octave
- Omega-3
- Ore
- Organ Glossary video
- Organic molecule
- Organism Glossary video
- Oscillate
- Osmosis
- Osteocyte
- Ovule
- Ovum
- Oxidation
- Oxide
- Oxidizer
- Oxygenated Glossary video
- Ozone layer
P
- Pangaea Glossary video
- Particle(s) Glossary video
- Peer review
- Peptide
- Periodic table
- pH
- Phagocyte
- Phenotype Glossary video
- Phloem
- Phospholipid
- Photon
- Photosynthesis Glossary video
- Pigment
- Pitch
- Planet
- Planetary nebula
- Plasma (biology)
- Plasma (physics)
- Plate boundary
- Polarity
- Polarization
- Pole
- Pollen
- Polymer
- Polyunsaturated
- Positive charge
- Potash
- Potential Energy Glossary video
- Power
- Precipitate
- Precision
- Predator
- Pregnancy
- Preservative
- Pressure
- Prey
- Primeval soup
- Prism
- Product Glossary video
- Prokaryote
- Propulsion
- Protein
- Proton
- Pure
- P-wave
- Pyroclastic flows
Q
- Quantum
- Quark
R
- Radiation
- Radio Waves Glossary video
- Radioactivity
- Rate of reaction
- Reactant Glossary video
- Reaction
- Reactivity
- Receiver
- Receptor
- Recessive Allele Glossary video
- Recombination
- Red giant
- Redox reaction
- Reduction
- Reflection
- Reflex arc
- Refraction
- Refractive index
- Renewable energy
- Resolution
- Resonance
- Resonant frequency
- Respiration
- Reversible reaction
- Ribosomes
- RNA
- Robot
- Rotation
S
- Salt
- Satellite
- Saturated fats
- Saturated solutions
- Saturn's rings
- Seafloor Spreading Glossary video
- Sediment
- Sedimentary Rock Glossary video
- Seismic waves
- Semiconductor
- Sensory
- Shockwaves
- SI
- Smog
- Solar cell
- Solar Eclipse Glossary video
- Solar flare
- Solar storm
- Solar System
- Solar wind
- Solid
- Soluble
- Solute
- Solution
- Solvent
- Sonic boom
- Source
- Spacecraft
- Species Glossary video
- Spectrometer
- Spectroscopy
- Spectrum
- Sperm
- Spontaneous
- Spontaneous emission
- Stable
- Star
- Starch
- Static electricity
- Stationary
- Stimulated emission
- Stratosphere
- Strong acid
- Strong material
- Strong nuclear force
- Subatomic particles
- Subduction
- Substance
- Substrate
- Sun
- Sunspot
- Superconductivity
- Supernova
- Supersonic
- Surface tension
- Sustainable
- S-wave
- Symbiosis
- Symptom Glossary video
- Synthetic Glossary video
T
- Taxonomy
- Telescope
- Temperate zones
- Temperature
- Tension Glossary video
- Terrestrial planets
- Theory
- Thermal
- Thermal decomposition
- Tissue Glossary video
- Topsoil
- Toxic
- Transducer
- Transform boundary
- Transmitter
- Transparent
- Transpiration
- Transverse wave
- Trench
- Troposphere
U
- Ultrasound
- Ultraviolet light
- Universe
- Unsaturated fats
- Urea
- Uterus
V
- Vaccine
- Vacuum
- Van der Waals Force
- Vaporize
- Variable Glossary video
- Vertebrate
- Vesicle
- Villi
- Virus
- Visible light
- Vitamin
- Volatile
- Volt (V)
- Volume
W
- Water Table Glossary video
- Watt (W)
- Wavelength Glossary video
- Weather
- Weathering
- Weight Glossary video
- White dwarf
- Work
- Wormhole
X
- X-Ray Glossary video
- Xylem
Z
- Zygote

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A particle of light or other electromagnetic energy.

A particle of light or other electromagnetic energy. Light has both wave and particle properties. This idea was largely developed by Albert Einstein in his study of the photoelectric effect - it was this that won him a Nobel prize.

Light has both wave and particle properties. This idea was largely developed by Albert Einstein in his study of the photoelectric effect - it was this that won him a Nobel prize.

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Science glossary film: Photon

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