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## Introduction MASS DENSITY AND VOLUME

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**Measuring Mass**• Mass - the quantity of matter in an object • standard unit is gram(g) • Measured using a digital scale or triple beam balance**Measuring Volume and Capacity**• Volume - the amount of space occupied by an object • standard unit is liter(L) • 1 L = 1000 ml = 1000 cm3 = 1 dm3 • Measured using a graduated cylinder • Capacity - a measure of the volume inside a container**Measuring Volume**• Measured with a graduated cylinder • Determine value of each mark on the scale • Read scale using the lowest position of the meniscus • Measure the meniscus at eye level from the center of the meniscus. • In the case of water and most liquids, the meniscus is concave. Mercury produces a convex meniscus.**Displacement**• Displacement • Amount of water an object replaces • Equal to its volume**Volume of a Solid, Irregular Object**• Displacement - amount of water an object replaces • Procedure • Place graduate beaker beneath spout • Fill the overflow canwith water until water begins to spill • Empty the excess water • Place object to be measured into the overflow can • Remove when water stops flowing out of the can • Measure the displaced water using a graduated cylinder.**Volume of a Solid, Irregular Object**• Displacement • Calculate the difference between the initial and final volume measurement.**Volume of a Solid, Regular Object**• Volume -length x width x height • V = 2.8 cm x 3.2 cm x 2.5 cm • V = 22.4 cm3 • Measured with a ruler**Calculating Density**• Density - a specific property of matter that is related to its mass divided by the volume. • D=M/V • the ratio of mass to volume • used to characterize a substance • each substance has a unique density • Units for density include: • g/mL • g/cm3 • g/cc**Measuring Time**• Time • metric unit is second (s)**Measuring Temperature**• Temperature - the degree of “hotness” of an object • standard unit is celsius (°C) • measured with a thermometer**Temperature Conversions**• Conversion Between Fahrenheit, Celsius, and Kelvin • Example: • Convert 75 ºC to ºF • Convert -10 ºF to ºC**Measurement Unit Conversion**• You can convert between units of measurement • within the metric system • between the English system and metric system**Conversion and the Metric System**ACS Ms. Grogan**Measurement Unit Conversion**• You can convert between units of measurement • within the metric system • between the English system and metric system**Unit Conversion**• Let your units do the work for you by simply memorizing connections between units. • Example: How many donuts are in one dozen? • We say: “Twelve donuts in a dozen.” • Or: 12 donuts = 1 dozen donuts • What does any number divided by itself equal? • ONE!**Unit Conversion**• This fraction is called a unit factor • Multiplication by a unit factor does not change the amount - only the unit. • Example:How many donuts are in 3.5 dozen? • You can probably do this in your head but try it using the Factor-Label Method.**Unit Conversion Rules**• Start with the given information… • Then set up your unit factor… • See that the original unit cancels out… • Then multiply and divide all numbers…**Unit Conversion Practice**• Example:Convert 12 gallons to units of quarts.**Unit Conversion Practice**• Example:Convert 4 ounces to kilograms.