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Mass Density
• Mass density is a measure of mass per volume
• Formula sheetHigh Density Low Density
M = VDm
Rearrange to solveNow needM and V
Mass Density: Mass per Volume
• Mass measured in units such as– US Customary: ounces (oz) or pounds (lb)– SI: grams (g), kilograms (kg)
• Volume measured in units such as– US Customary: Cubic inches or feet (in.3 or ft3)– SI: Cubic centimeter or meter (cm3 or m3)
Material Mass Density (kgm-3)Atmosphere (Earth @ Sea Level) 1.2
Water (Pure) 1,000
Water (Sea) 1,030
Aluminum 2,700
Steel (1018) 7,833
Lead 11,340
Sources of Mass and Volume Measurement• Mass
– Typically measured directly using a scale• Volume
– Calculate based on geometry and dimension measurements
– Indirect measurement using water displacement or 3D scanner
Volume: Calculation
• Some object volumes can be calculated• What is the volume formula for each object?
Volume: Indirect Measure
• Volume of an irregular object can be determined indirectly with fluid displacement Level
Elevates
Volume: Indirect Measure
• Record water level with only water• Add samples• Record new level• Difference is sample volume
VolumeChange
Meniscus shape isexagerated for clarity
Read level here