3.3 Mass, Volume, Weight and Density

• Conversions of units of mass
• Relating mass and weight
• Mass, volume and density of substances

• convert units of mass from one form to another in different situations
• relate mass and weight in real-life situations
• determine mass, volume and density of different substances
• apply density to real-life situations
• recognise the use of density in daily life

“How do you weigh materials and objects?”

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1. Tools for weighing, and weighing honestly
   40 min · 1 practice tasks · quiz
   Know which instrument gives a true mass, and why an accurate scale protects both trader and customer.
2. Units of mass
   40 min · 1 practice tasks · quiz
   Milligram, gram, kilogram and tonne sit on a ladder with a thousand between each step.
3. Converting units of mass
   40 min · 1 practice tasks · quiz
   Multiply going down the ladder to a smaller unit, divide going up to a bigger one.
4. Mass and weight
   40 min · 1 practice tasks · quiz
   Mass is the matter in an object; weight is the pull of gravity on it, and that pull changes with place.
5. What density means
   40 min · 1 practice tasks · quiz
   Density is how much mass is packed into each unit of volume.
6. Finding mass, volume or density
   40 min · 1 practice tasks · quiz
   One relationship rearranges three ways, so any two of mass, volume and density give the third.
7. Density and floating
   40 min · 1 practice tasks · quiz
   Compare a material with water at 1 g per cubic centimetre to predict whether it floats or sinks.
8. Density in daily life
   40 min · 1 practice tasks · quiz
   Close the sub-strand by using mass, volume and density on real Kenyan decisions.