Page 44 - ICC Science Dictionary (spreads)

Word Definition Topic(s) Word Definition Topic(s)

nervous Body system that includes the B2, B5 non-com- A disease that is not transferred B3
system brain, spinal cord and nerves. municable between people or other

net Overall. B1a, B1b disease organisms.
non-contact Force exerted between two objects, TP4, P2, P5, P7
neurological A condition affecting the nervous B2 force even when they are not touching,
disorder system - the brain, spinal cord, or such as the force of gravity.
nerves - and which may also have
an effect on associated systems non- In chemistry, a system in which C3
such as the muscles. enclosed gases or other substances can
system enter or leave during a reaction.
neurone Nerve cells. They carry an B5
electrical message or impulse non-metal Element that is a poor conductor C1, C2
when stimulated. of electricity and heat, and which
forms acidic oxides.
neurotrans- Chemical involved in passing B5
mitter messages from one nerve cell to non- A resource that cannot be B7a, B7b, C3
the next across a synapse. renewable replaced when it is used up, such
as oil, natural gas or coal.
neutral When a substance is neither acidic TC3, C4
nor alkaline, and has a pH of 7. normal An imaginary but useful line at P6
right angles to the boundary
neutralisation Where an acid reacts with an TC3, C3, C4, between air/glass. All angles are
alkali to produce a neutral solution C5, C10 measured to this line.
of a salt and water.
normal line A line drawn on ray diagrams, TP2
neutron Uncharged subatomic particle, with C1, P2, P4 at a right angle to a surface or
a mass of 1 relative to a proton. The boundary from which angles of
relative charge of a neutron is 0. rays are measured.
Newton Unit for measuring forces (N). TP4 norovirus A common 'upset tummy' B3

NHS The National Health Service (NHS) is B5 infection caused by a virus which
a free health care system in the UK. is highly contagious.
nicotine The addictive substance found in B2 north pole In a magnet, the end that is attracted P7
tobacco and tobacco smoke. to the Earth's magnetic north pole.
nitrate The chemical absorbed from the B3, B7a, B7b nuclear The splitting of a large nucleus to P4
soil by plants to produce their fission produce two smaller ones. Two or
protein. three neutrons are also released in
the process. The energy from the
neutrons powers a nuclear reactor.