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Measurement-A Common Language Density, Time, & Temperature

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Density

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Density / Densidad The measure of how much mass is contained in a given volume. / Es la medida de cuanta masa esta contenida en un volumen específico.

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The formula of density is: / La formula para densidad es: Density = Mass / Volume Densidad = Masa / Volumen

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Comparing Densities - Inferring: Which item has the greater density? Comparando densidades – Infiriendo: Cual objeto tiene la mayor densidad? The bowling ball / La pelota de Bolear Since the bowling bowl has a greater mass, it has a greater density, even though both balls have the same volume. / Debido a que la pelota de bolear tiene la mayor masa esta tiene la mayor densidad. Auque ambas tienen el mismo volumen.

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Density / Densidad Units of Density / Unidades de densidad

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Why is density expressed as a combination of two different units? Porque la densidad es expresada como una combinación de dos unidades diferentes? Because density is actually made up of two other measurements – mass and volume – an objects density is expressed as a combination of two units / La densidad esta contituida por dos otras medidas la masa y el volumen, por lo tanto la densidad se expresa como una combinacion de las dos.

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Two Common Units For Density / Dos unidades comunes para densidad. Grams per cubic centimeter (g/cm³) / Gramos por centimetro cúbico (g/cm³) Grams per milliliter (g/mL) / Gramos por mililitro (g/mL)

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Math Practice: Práctica matemática: What is the density of a wood block with a volume of 125 cm³ and a mass of 57 g? Cual es la densidad de un bloque de madera con un volumen de 125 cm³y una masa de 57 g? Density = mass / volume / Densidad = masa / volumen Density = 57 g / 125 cm³ Densidad = 57 g / 125 cm³ Density = 0.46 g/ cm³ Densidad = 0.46 g/ cm³

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Math Practice: What is the density of a liquid with a mass of 45 g and a volume of 48 mL? Prática matemática: Cuál es la densidad de un liquido con una masa de 45 g y un volumen de 48ml? Density = mass / volume Densidad = masa / volumen Density = 45 g / 48 mL Densidad = 45 g / 48 mL Density = 0.94 g/mL Densidad = 0.94 g/mL

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Density / Densidad Densities of Common Substances / Densidades de sustancias comunes

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The density of a substance is the ______for all samples of that substance. / La densidad de una sustancia es la _____ para todos las muestras de esa subtancia. Same / Misma

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An object will float if it is _____ _____ than a surrounding liquid. / Un objeto flota si es _____ _____ que el liquido circundante. Less dense / menos denso

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Figure 6: Applying Concepts: How could you use density to determine whether a bar of metal is pure gold? If the bar of gold has a density that is greater than or less than 19.3 g/cm³, then the sample is not pure gold. Densities of Some Common Substances SubstanceDensity (g/cm³) Air0.001 Ice0.9 Water1.0 Aluminum2.7 Gold19.3

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Reading Checkpoint (page 53): Will an object with a density of 0.7 g/cm³ float or sink in water? An object that has a density of 0.7 g/cm³ will float in water (1 g/cm³) because it is less dense than water

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Time

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Units of Time

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What is the SI unit used to measure time? The second(s) is the SI unit to measure time

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Common Conversions for Time 1s= =60 s 1h=

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Common Conversions for Time 1s=1,000 ms =60 s 1h=

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Common Conversions for Time 1s=1,000 ms 1 min=60 s 1h=

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Common Conversions for Time 1s=1,000 ms 1 min=60 s 1h=60 min

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Time Measuring Time

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Why would a stop watch be used to measure time in an important race? Because stop watches measure in units smaller than the second These measurements include the tenth and hundredth of a second

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Reading Checkpoint (page 53) - How many milliseconds are in one second? 1,000 milliseconds

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Temperature

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Units of Temperature

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A common unit to measure temperature is the ___ ___. Celsius scale

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Water freezes at ______ and boils at ______. 0 °C 100 °C

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The normal human body temperature is approximately ________. 37 °C

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What is the official SI unit for temperature? The Kelvin Scale (°K) 0 °K = 273 °C

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Figure 8: Measuring Temperature - Observing: At what temperature on the Kelvin scale does water boil? 373 °K

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What is absolute zero? Absolute zero is considered by scientists to be the coldest temperature possible 0 °K or –273 °C

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Temperature Measuring Temperature

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What instrument is used to measure temperature? Thermometer

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