representative- analysts work with samples. samples of any item must be representative.
preservation of samples- important to prevent any changes or deteriation of samples.
Planning- factors to be considered: where,when, how to collect samples, how much to take, storage, transportation
Formulae- any calculations needed in standard operating procedures
area of rectangle (formula)-
area in M2 = length of longer side X lenfth of shorter side
Measurement uncertainty- all measuremnts have uncertainty. e.g- a drug purity may be given 99.1 +- 0.2%. indicates value lyes between 98.9 and 99.3%.
recording visual information
written descriptions- notes. quick and easy, record details overtime
drawings- visual information. quick sketch to a detailed, accuarte, measured drawing.
photographs and videos- quick accurate way to record. 24-hour surveillance. image-enhancements
comparing images- fingerprints, pictures of faces
indentify features- features to identify sample
compound light microscope- used to see things that are too small to be seen by eye. 2 magnifying lens. 1 called objective lens, other called eyepiece lens.
magnifying power- magnification (microscope)= magnification(eyepiece) X magnification(objective)
resolving power- detailed microscope= high resolving power. best light microscopes is about X1500