Precise measurements are ones in which there is very little spread about the mean value. Precision depends only on the extent of random errors – it gives no indication of how close results are to the true value.

A prediction is a statement suggesting what will happen in the future, based on observation, experience or a hypothesis

The Principle Of Superposition states that when two waves of the same kind meet at a point in space, the resultant displacement at that point is the vector sum of the displacements that the two waves would separately produce at that point.

Probability is the likelihood of an event occurring. It differs from chance in that it can be expressed mathematically. In statistical tests, probabilities are usually expressed as a decimal fraction of one. Thus a probability of 0.01 means that an event is likely to occur 1 time in every 100.

A steroid hormone released by the corpus luteum of the ovary that stimulates the uterus to prepare for pregnancy.

 UK:  The prescribed syllabus that pupils must be taught ateach key stage in the National Curriculum

questioning or a short test

The maximum and minimum values of the independent or dependent variables. For example a range of forces may be quoted as either: "From 0 N to 20 N" or "From 20 N to 0 N"

Organs or cells able to respond to light, heat, or other external stimuli and transmit signals to sensory nerves.

A measurement is repeatable if the original experimenter repeats the investigation using same method and equipment and obtains the same results

A measurement is reproducible if the investigation is repeated by another person, or by using different equipment or techniques, and the same results are obtained.

This is the smallest change in the quantity being measured (input) of a measuring instrument that gives a perceptible change in the reading

A process which estimates the likelihood that exposed people may have health effects. The four steps of a risk assessment are: hazard identification (Can this substance damage health?); dose-response assessment (What dose causes what effect?); exposure assessment (How and how much do people contact it?); and risk characterization (combining the other three steps to characterize risk and describe the limitations and uncertainties).

The process of deciding how and to what extent to reduce or eliminate risk factors by considering the risk assessment, engineering factors (Can procedures or equipment do the job, for how long and how well?), social, economic and political concerns.

A highly contagious viral disease, spread through contact with discharges from the nose and throat of an infected person

Saguaro National Park, located in Tucson, Southern Arizona, is part of the United States National Park System.

A scalar quantity is one which has magnitude but no direction.

 A quantity, such as mass, length, or speed, that is completely specified by its magnitude and has no direction

Simple Harmonic Motion (SHM) is defined as the oscillatory motion of a particle whose acceleration a is always directed towards a fixed point and is directly proportional to its displacement x from that fixed point but in the opposite direction to the displacement.

A line graph that shows the general shape of the relationship between two variables. It will not have any points plotted and although the axes should be labelled they may not be scaled.

Soil pollution is caused by the presence of  human-made chemicals or other alteration in the natural soil environment.

Non-liquid, non-gaseous category of waste from non-toxic household and commercial sources.

The largest group of organisms where two hybrids are capable of reproducing fertile offspring, typically using sexual reproduction.

The rate of change of distance with respect to time.

The chemical compound with the formula SO2. At standard atmosphere, it is a toxic gas with a pungent, irritating, and rotten smell

These are the equations of motion for a body undergoing constant acceleration





where..
s = distance (metres, m)
u = initial velocity (metres per second, ms^-1)
v = final velocity (metres per second, ms^-1)
a = acceleration (metres per second squared, ms^-2)
t = time (seconds, s)

A special type of interaction between species. Sometimes beneficial, sometimes harmful, these relationships are essential to many organisms and ecosystems, and they provide a balance that can only be achieved by working together

 Junction between two nerve cells, consisting of a minute gap across which impulses pass by diffusion of a neurotransmitter.