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Published byVincent Greene Modified over 4 years ago

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Bell Ringer: On a sheet of paper please answer the following questions. Do all bell ringers on the same sheet of paper! 1. What is the definition of Biology? 2. What are the 8 characteristics of life.

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**Unit 1: Metric System A Common Language**

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**Why A Standard Measurement System?**

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**When and why was the metric system invented?**

The metric system was invented in 1790 The metric system was invented because countries were using many different systems of measurement causing confusion and lack of consistency The metric system was invented by a group of French scientists aunes, cubits, leagues, palms, stadia, furlongs, rods, pecks

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Metric System A system of measurement used by the majority of countries on Earth based on the number 10 Countries that don’t use the Metric System… Liberia, Myanmar, and United States

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**Scientists all over the world use the International System of Units to measure:**

Length Volume Mass

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**Key Concept: Why do scientists use a standard measurement system?**

Allows scientists to compare data and communicate with each other about their results Also allows experiments to be repeated

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Length

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What is length? Length is the distance from one point to another

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**The basic unit of length in the Metric System is the …**

Meter (m)

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**Measuring Length Tools: Meter Stick and Ruler**

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**The longer lines on the metric ruler are called…**

centimeters

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**The shorter lines on the metric ruler are called…**

millimeters

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Figure 2: Calculating: Measure the turtle in figure 2 from the rear of its shell to the front of it’s shell. Record its length in both centimeters and millimeters. 8.8 cm 88 mm

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Mass

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Mass The measure of the amount of matter an object contains

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**The basic unit of mass in the Metric System is the…**

Gram (g)

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**Measuring Mass Tool: Triple Beam Balance**

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**How does a triple-beam balance work?**

A triple-beam balance works by comparing the mass of the object you are measuring to a known mass When you use a triple-beam balance, you: Place the object on the pan Shift the riders on the beams until them balance the mass of the object Start with the large rider (increments of 100) Next, the medium sized rider (increments of 10) Lastly, the small rider (increments of 1)

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**Figure 3: Observing - What is the mass of this turtle?**

153.7 grams

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**Why do scientists prefer to use the mass of an object instead of its weight?**

Scientists prefer to use an objects mass instead of its weight because mass does not change when the force of gravity does

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**Label the different parts of the triple-beam balance.**

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**Label the different parts of the triple-beam balance.**

Pan

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**Label the different parts of the triple-beam balance.**

Pan Riders

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**Label the different parts of the triple-beam balance.**

Beams Pan Riders

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**Label the different parts of the triple-beam balance.**

Beams Pan Riders Pointer

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Volume

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Volume The amount of space an object takes up

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**The basic unit of volume in the Metric System is the… …**

Liter (l)

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**The Tool used to measure the volume of liquids is called the…**

Graduated cylinder.

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**This instrument has markings that are in increments of…**

1 milliliter (mL)

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Meniscus The curve in the top surface of water in the graduated cylinder

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**Figure 4: Observing - What is the proper way to read a meniscus?**

Read the milliliter marking at the bottom of the curve

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**Volume of Rectangular Solids**

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**How can the volume of a solid object such as a shoebox be measured?**

To measure a solid objects that are regular shaped, a formula for volume can be applied

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**The Metric System unit known for measuring solids with a larger volume is known as the…**

Cubic meter (m³) Cubic centimeter (cm3) Cubic millimeter (mm3).

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**Volume = Length x Width x Height**

Tool: The formula for calculating the volume of a rectangular object is: Volume = Length x Width x Height

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**Why is the unit cm³ used when calculating the volume of a rectangular object?**

When multiplying the object’s length, width and height, the cm units are also multiplied cm x cm x cm = cm³

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**Volume = Length x Width x Height**

Suppose a cereal box is 10 centimeters long, 4 centimeters wide, and 20 centimeters high. What would be the volume of the box? Volume = Length x Width x Height Volume = 10 cm x 4 cm x 20 cm Volume =

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**Volume of Irregular Solids**

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**How is the volume of an irregular solid such as a rock measured?**

To measure the volume of an irregular solid, immerse the object in water, and measure how much the water level rises Tool (Method) : Water displacement method using a Graduated Cylinder

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**Basic Unit of Volume for Irregular Solids =**

cL3 mL3

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**How does the water displacement method work?**

Record the volume of water in the graduated cylinder Carefully place the irregular solid into the water. Record the volume of the water plus the object Subtract the volume of the water alone from the volume of the water plus the object

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**King Henry Died Basically Drinking Chocolate Milk**

To convert to a smaller unit, move the decimal point to the right Basic Unit 1 Meter 1 Liter 1 Gram Kilo 1000 Units Hecto 100 Units Deka 10 Units Deci 0.1 Units Centi .01 Units Milli .001 Units To convert to a larger unit, move the decimal point to the left King Henry Died Basically Drinking Chocolate Milk

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**TRY THIS USING THE STAIRCASE METHOD**

1000 mg = ______ g 1 Step 1: Determine if you are going to go up or down the ladder. Step 2: Determine how many steps there are from milligrams to grams. Step 3: Move the decimal point the amount of places that was determined in steps 1 & 2.

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**TRY THIS USING THE STAIRCASE METHOD**

.15 L = __________ ml

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**TRY THIS USING THE STAIRCASE METHOD**

.15 L = __________ ml 150

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Bell Ringer What are the basic units of measurements for Length Volume Mass Convert 1.5 km to m Convert 120 ml to cl What tool would you use to measure mass? What is the formula for figuring volume of an rectangular shaped object?

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