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measurements ch1
measurements chapter 1 test
Question | Answer |
---|---|
English System | a measurement system used for everyday measurements in the united states |
SI | the international system of units used by scientists |
measurement | when someone determines the amount of something using a value and a unit |
accuracy | when you describe how close a quantity is to its true value |
precision | describes how close together repeated measurements are |
resolution | refers to the smallest interval that can be measured |
unit | a standard amount like a kilometer or a gallon which is used to communicate various quantities |
distance | describes how far it is from one place to another |
length | the the amount of space between two point is measured in units of length |
light year | the distance light can travel in one year |
meter | a unit of length in SI that equals 100cm |
parsec | is equal to about 3.26 light years |
significant digits | meaningful digits in a measured quantity |
conversion factor | a ratio that has a value of one and is used when setting up unit conversion problems |
dimensional analysis | a method of using conversion factors and unit canceling to solve a unit conversion problem |
scatter plot or x y graph | often used to determine if one variable causes an effect in another variable |
independent variable | can also be called manipulative variable |
inverse relationship | when one variable decreases as the other increases |
graph | a visual representation of data; there are four types |
direct relationship | is shown on the continuous smooth curve rising from left to right on a scatter plot |