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# Nature of Science

### Vocab from the NOS unit

TermDefinition
observation Using one or more of your senses to gather information
constant Conditions in an experiment that are kept the same
precision Close, repeated measurements
inference An educated guess based on previous knowledge or cues
prediction An educated guess about what will happen in the future
control group Variables are compared to this "normal" group that isn't changed.
meter Metric unit of measurement for distance
liter Metric unit of measurement for volume
International System of Units Metric system, based on powers of 10
accuracy How close a measurement is to the correct value
hypothesis Explanation of an observation that can be tested
independent variable This is what the scientist changes in an experiment
gram Metric unit of measurement for mass
scientific law Rule that describes a repeatable pattern in nature
dependent variable What is measured or observed in an experiment
experiment A test of the hypothesis
scientific theory An explanation (why or how) of observations that have occurred many, many times
scientific notation A method of writing large and small numbers in a shorter form
quantitative Observations that include numbers
qualitative Observations that are descriptions
volume Amount of space an object takes up, use grad. cyl. or LxWxH
mass Amount of matter in an object, use scale or TBB
density amount of mass per unit volume (m/v)
density of water 1 g/ml
water displacement Method used to find volume of a solid
3 metric base units meter, liter, gram
1 cm = ? mm 10 mm
Name the metric prefixes in order from biggest to smalles Kilo, Hecto, Deka, (base unit), deci, centi, milli
1 meter = ? cm 100 cm
triple beam balance tool for measuring mass (units are grams)
graduated cylinder tool for measuring volume of a liquid (units are ml)
measuring irregular solid volume water displacement (like a rock or ball)
measuring regular solid volume Measure with a cm ruler and multiply: LxWxH
density measures how tightly packed particles are in an object
density of objects that float in water less than 1 g/cm^3
density of objects that sink in water greater than 1 g/cm^3
To calculate the density of an object D = mass divided by volume
Created by: jhenretta

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