Admin Table of Contents
What is a ratio of equivalent measurements used to convert a quantity?
Physical Science Chapter 1.3
| A | B |
|---|---|
| conversion factor | a ratio of equivalent measurements that is used to convert a quantity expressed in one unit to another unit |
| precision | a gauge of how exact a measurement is |
| significant figures | all the digits that are known in a measurement, plus the last digit that is estimated |
What is a measure of how close a series of measurement are to one another?
precision. Refers to how close a series of measurements are to one another.
What is an equivalence How are equivalence values used in conversion factors?
Central to this is the concept of an equivalence statement which says two ways of representing the same thing are equivalent. For example 12 in = 1 foot is an equivalence statement. An equivalence statement allows you to convert from one unit to the other, and this is done by creating a conversion factor.
How do you convert units from one system to another?
Summary
- Write the conversion as a fraction (that equals one)
- Multiply it out (leaving all units in the answer)
- Cancel any units that are both top and bottom.
Is a ratio that compares the mass of an object to its volume?
Density is the ratio of how much mass is in an object compared to the volume of that object. Density is calculated by dividing an object’s mass by its volume.
How may units be used to check on whether a conversion factor has been used correctly?
(When identical units divide to yield a factor of 1, they are said to “cancel.”) Using dimensional analysis, we can determine that a unit conversion factor has been set up correctly by checking to confirm that the original unit will cancel, and the result will contain the sought (converted) unit.
How do you convert one system of units to another using dimensional analysis?
Unit analysis is a form of proportional reasoning where a given measurement can be multiplied by a known proportion or ratio to give a result having a different unit or dimension. Dimensional analysis involves using conversion factors, which are ratios of related physical quantities expressed in the desired units.
Is a measurement of the quantity of matter in an object?
mass: A measure of the amount of matter that an object contains. The mass of an object is made in comparison to the standard mass of 1 kilogram.