MEASUREMENT IN SCIENCE 7 th grade science 2011

MEASUREMENT IN SCIENCE 7 th grade science 2011

After the quiz… • Fold the colored paper in half hamburger style • Glue it in the next page of your science notebook • Title it “MEASUREMENT IN SCIENCE” • Copy the following table on the inside cover (not too big) • Number to 10 Object • After this, 1 begin page 10 & 11 in the packet 2 3 4 5 6 7 Measurement

When Measuring… • Always use a unit • cm, m. L, g, mm, • Be precise • No rounding, no estimating (unless specified) • NEVER use fractions, ONLY use decimals • 16 1/2 – NO!!! • 16. 5 - YES!!!

Customary vs. Metric • Why should you use metric over customary in science? • Based on a 10 point scale • Easier to use

Customary vs. Metric

MEASUREING MASS • Tool: electronic scale and balance • Use: to measure the amount of matter in an object • Common Unit: gram (g), kilogram (kg) • 1 kilogram= 1000 grams **make sure scale is always set to gram (g)**

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MEASURING TIME • Tool: stopwatch • Use: to measure time elapsed • Common unit: seconds (sec), minutes (min), hours **Read directions- do you stop watch during a lab or does it keep running through experiment**

MEASURING LENGTH • Tool: Meter stick, ruler • Use: to measure distance • Common unit: meter (m), centimeter (cm), millimeter (mm) • 10 mm = 1 cm • 100 cm = 1 m **No fractions/inches/ feet… all metric measurement**

Measuring Length How many millimeters are in 1 centimeter? 1 centimeter = 10 millimeters What is the length of the line in centimeters? _______cm What is the length of the line in millimeters? _______mm What is the length of the line to the nearest centimeter? ____cm HINT: Round to the nearest centimeter – no decimals. Ruler: http: //www. k 12 math. com/math-concepts/measurement/ruler-cm. jpg

MEASURING TEMPERATURE • Tool: thermometer • Use: to measure how fast or slow particles are moving in an object • Common units: Celsius (C 0), Fahrenheit (F 0) **watch your scale**

What is the difference between temperature and heat? Temperature is a measure of the average kinetic energy of atoms. Thermometers are used to measure temperature In other words: the faster the atoms move = the higher the temperature, & the slower the atoms move = the lower the temperature. Less Heat More Heat

MEASURING VOLUME • Tool: Graduated cylinder or ruler (L x W x H) • Use: to find how much space an object takes up • Common unit: Liter (L), milliliter (m. L) • 1000 m. L = 1 L **watch your scale & read at the bottom of the meniscus (curve)**

• LAB SAFETY/TOOLS/MEASUREMENT TEST NEXT FRIDAY