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Science Chapter 1-4
Chapter 1 Section 4 Holt Life Science
Term | Definition |
---|---|
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) |