Practical skills Words
When a measurement is close to the real value.
Check that an instrument is measuring correctly,by comparing against a standard.
A variable that has a label rather than a number e.g colour.
A variable that has a number rather than a label e.g 2.4W, 30cm or 4A.
The variables that must be kept the same.
The variable that you measure.
As one value increases, the second value increases by the same amount.
A variable that can only take specific values
When only one variable is changed,and all others are kept the same.
The slope of a graph
A theory based on what you think.
The variable in an experiment that you change
The smallest division between two measurements.
If one measurement doubles, the other measurement goes down to a half.
When a theory or set of results is reviewed and verified by other scientists.
When results are close together.
A more detailed hypothesis where you state what you think will happen.
A random error is when an experiment produces wrong results due to a random factor.
The highest and lowest results in a set of results.
Results are reliable if they can be obtained again and again.
Results are repeatable if the same person repeats the same method and gets similar results.
Results are reproducible if two different people follow the same method and get similar results.
A measuring device with a high level of resolution is one that is able to measure a smaller change.
A systematic error is when a method or piece of equipment has the same error on it and this error comes out in all of the measurements.
If results could be between a number of values then we say that the result is uncertain.
Results are valid if the experiment was done as a fair test
Something that you can change in an experiment.
When a measuring instrument gives a reading even though the true value is zero.