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| system of measurement based on the number 10 |
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| SI (International System of Units) |
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| modern scientists use a version of the metric system, scientists all over the world use SI units to measure length, volume, mass, density, temperature, and time |
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| the basic unit of length in the SI system in the meter (m) |
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Definition
measure of the amount of matter an object contains
-the basic unit of mass in the SI system is the kilogram (kg) |
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| measure of the force of gravity acting on an object |
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| amount of space an object takes up |
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| Volume= Length X Width X Height |
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| To measure the volume of a liquid, just pour it into a container with markings that show the volume. Scientists commonly use a graduated cylinder to measure liquid volumes. Notice that the top surface of the water in the graduated cylinder is curved. The curved is called the meniscus. To determine the volume of water, you should read the milliliter marking at the bottom of the curve. |
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| a measure of how much mass is contained in a given volume |
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| an approximation of a number based on a reasonable assumptions. |
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| Is estimation the same as guessing? |
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Definition
| Estimating is not the same as guessing because an estimate is based on known information. |
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| refers to how close a measurement is to the true or accepted value. |
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| What is an example of accuracy? |
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| An accurate clock would read 4:00 PM However, if all your friend’s clocks are always 15 minutes late, they can’t be said to be precise. |
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| refers to how close a group of measurements are to each other |
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| When are precision and accuracy both important? |
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Definition
| Both accuracy and precision are important when you make measurements. |
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Definition
| the significant figure in a measurement include all of the digits that have been measured exactly, plus one digit whose value has been estimated |
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Definition
| calculations used to determine how accurate, or close to a value, an experimental value really is |
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| the numerical average, calculated by adding up all of the numbers and then dividing by the total numbers of items in the list |
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| the middle number in a set of data |
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| How do I find the median? |
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Definition
| To find the median, place all the numbers in order from smallest to largest. If the list has an odd number of entries, the median is the middle entry in the list. If a list has an even number of entries, you can find the median by adding the two middle numbers together and dividing by two. |
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| the number that appears most often in a list of numbers |
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| good preparation helps you stay safe when doing science activities in the laboratory |
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| Who do you notify if there is an accident in the lab? |
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Definition
| Always notify your teacher immediately if there is an accident. Then, listen to your teacher's directions and carry them out quickly. |
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