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| The metric system is a system of measurement based on the number 10. |
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| Modern scientists use a version of the metric system called the International System of Units (SI). |
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| Mass is a measure of the amount of matter an object contains. |
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| Weight is a measure of the force of gravity acting on an object. |
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| Volume is the amount of space an object takes up. |
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| Notice that the top surface of the water in the graduated cylinder is curved. This curve is called the meniscus. |
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| Density is a measure of how much mass is contained in an object , divide it's mass by it's volume. |
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| An estimate is an approximation of a number based on reasonable assumptions. |
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| Accuracy refers to how close a measurement is to the true or accepted value. |
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| Precision refers to how close a group of measurements are to each other. |
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| significant figures refer to the digits in a measurement. |
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| Percent error calculation are used to determine how accurate, or close to the true value, an experimental value really is. |
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| The mean or numerical average, is calculated by adding up all of the numbers and then dividing by the total number of items in the list. |
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| The median is the middle number in a set of data. |
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| The mode the number that appears most often in a list of numbers. |
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