aberration

absolute magnitude

absolute zero

acceleration

activity

alpha particle

alternating current (a.c.)

ammeter

ampere

angular displacement

antinode

antiparticle

apparent magnitude

astronomical unit (AU)

atom

atomic number or proton number

atto

Avogadro’s number

background radiation

beta particle

big bang theory

binary star

binding energy

black hole

Boltzmann constant

Brownian motion

candela

capacitor

centi

centre of gravity

centre of mass

centripetal force

chain reaction

charge

chemical energy

chromatic aberration

circuit

circuit breaker

cloud chamber

coherent

concave

conductor

conduction of heat

control rod

convection

conventional current

cosmic rays

cosmology

coulomb

current

density

diffraction

diode

direct current (d.c.)

echo

efficiency

fission

galaxy

Hooke’s Law

isotope

joule

kinetic energy

L E D

mass

National Grid

Ohm’s Law

pascal (Pa)

quasar

radioactivity

SI units

terminal velocity

ultrasound

vacuum

white dwarf

X-rays

Young modulus

zeroth law