Page 28 - ICC Science Dictionary (spreads)

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

fluid A substance that can flow, such as P5 fossil Plant/animal remains preserved TC5
a liquid or a gas. over millions of years.

fluorescent When a chemical absorbs B3 fossil fuel A natural fuel such as coal or gas, TC6, C9, P1
ultraviolet light and releases it as formed over millions of years from
visible light. the remains of plant and animal

focal length The distance between the centre P6 matter.
of the lens and the focal point. fraction In fractional distillation, such as C1, C7

foetus The developing baby during TB3 that of crude oil, the different
pregnancy. parts of the original mixture are
called fractions. The substances in
food chain A sequence (usually shown as a TB2, B7a, B7b each fraction have similar boiling
diagram) of feeding relationships points to each other.
between organisms, showing
which organisms eat what and fractional In fractional distillation a mixture C1, C7, C10
the movement of energy through distillation of several substances, such as
trophic levels. crude oil, is distilled and the
evaporated components are
food web A network of food chains, showing TB2, B7a, B7b collected as they condense at
how they all link together. different temperatures.

force A push or a pull. The unit of force is C2, P1, P2, P3, fractionating Piece of apparatus in which C7
the newton (N). P5 column mixtures separate during
force Something that increases the P5 fractional distillation.
multiplier effect of a force. free body A simplified drawing of an object P5
foreign Not the same as those of the host B3 diagram or system showing the forces
antigens organism. These are recognised by acting on it. The forces are shown
the immune system of the host and acting away from the centre of a
attacked by its white blood cells. box or dot.

formula A combination of symbols C1, C2, C3, freeze A change of state in which liquid C8, P3
that indicates the chemical C4, C10 becomes solid by cooling.
composition of a substance. freeze thaw Water seeps into rock cracks; TC5

formulation A mixture that is always made with C8, C10 freezes and expands. This creates
the same proportions of the same a bigger crack resulting in part of
substances. the rock to break off.