100cm3 Measuring Cylinder Error
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very nature involves errors and inaccuracies in the course of experimental work. The important issue here is that the inaccuracies are minimised and errors recognised as part http://ibchem.com/IB16/03.63.htm of the results and conclusions process. Experimentation and measurement Apparatus and instrumentation Inaccuracy Instrumental tolerance Error recording Percentage error calculation Multi-stage procedures Experimentation and measurement Chemistry is an experimental science. All of the laws, rules and principles of chemistry have been elaborated by experiment and observation over many years. This process is known as the experimental method and involves the following stages: 1 measuring cylinder Observation of a fact pattern or principle. 2 Hypothesis as to the causal factors 3 Experiment to support the hypothesis 4 Repetition and duplication of the experimental results by other research groups. 5 General acceptance of the hypothesis. top Experimental science in schools In principle, there are few actual measuring devices in common use in the laboratory of a normal school. Direct uncertainty of measuring measurements may usually be made of the following quantities: Temperature Liquid volume Gas volume Time Mass Length A more specialised laboratory also may have devices for measuring: Voltage Current pH Light absorbance top Apparatus and instrumentation The common laboratory apparatus used to take direct measurements: Concept Instrument units abbreviation Temperature Thermometer degrees Celsius ºC Mass Electronic balance grams / kilograms g / kg Time Stopwatch seconds s Length Ruler / Micrometer metres m Liquid volume Measuring cylinder / pipette / burette centimetres cubed / litres cm3 / dm3 Gas volume Gas syringe centimetres cubed / litres cm3 / dm3 top Inaccuracy Any experiment has inherent inaccuracies that must be considered when analysing results. These inaccuracies, or errors, derive from three general sources. Instrumental tolerance Experimental design Human limitations The reliability of any experimental data must take these factors into consideration. In many cases it is possible to estimate the degree of accuracy quantitatively by consideration of the percentage error in the measurements at each stage of a procedure. top Instrument tolerance The instrumental tolerance is the degree of accuracy of a specific