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Science Chapter 1-4

Chapter 1 Section 4 Holt Life Science

SI International System of Units
area is measured in square units
liter metric unit for meausuring liquid.
area the amount of surface something has.
compound light microscope consists of a tube with lenses, a stage and a light source, often used in classrooms
electron microscope tiny particles of matter are used to magnify image
transmission electron microscope electrons pass through the specimen and produce a flat image, magnifies up to 200,000 times the actual size.
scanning electron microscope electrons bounce off the surface of the specimen and produce a 3D image, magnifies up to 100,000 times actual size
x-rays used for almost a century (100 years)to see internal structures of organisms (bones, heart, lungs) and the stuctures of proteins
CT scans (computerized tomography) low dosage x-ray beams are passed through the body at different angles, and often a dye is injected to help highlight tissues- provides a clearer, more detailed image than x-rays useful for studying brain and spinal tissue.
CT scans computerized tomography
MRI magnetic resonance imaging
MRI provides a clearer image than x-rays by using short bursts of magnetic field, useful for studying brain and spinal tissue
CT, MRI, SEM and TEM data and images are transferred to a computer to create the image
computer used to collect, store organize and analyze information, can create graphs, solve math problems and analyze data
graduated cylinder measures the volume of liquids and irregular shaped solids, basic unit is liter, can be converted to cubic centimeters
thermometer measures temperature (how hot or cold an object is) basic unit is degree
balance scale or triple beam balance measures the mass of an object,basic unit is kilogram
meter stick measures the length of objects, basic unit is meter
benefit of using metric system easier to compute, base 10, more accurate, less errors.
benefit of using metric system shared by all scientists worldwide
volume the amount of space an object occupies (takes up)
Created by: tziccardi