Thursday 25 April 2013

5.3 describe experiments to determine density using direct measurements of mass and volume

Using a set mass of one object (eg 100g of water) change the space its in (eg 200ml cylinder taking ten off the ml each time.) Use the formula mass/volume to find the density, it will go up as the volume decreases.

11 comments:

  1. This doesn't make sense, take ten off the what ml?

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    1. Decrease the size of the container by 10ml each time.
      So start with a 200ml container:
      100g/200ml= 0.5 g per ml
      Then use a 190ml container:
      100g/190ml= 0.53 g per ml
      and so on, watching the density change.

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  2. This is how I would do it:

    1. Measure the mass of the object you are measuring the density of
    2. Measure the volume:
     If the object is irregular: take a set amount of water (eg. 100ml) and put the object in the water making sure it is fully submerged. Measure the rise of the water (eg. From 100ml to 130ml).
     If object to regular you can measure lengths to find the volume.
    3. Then use formula mass/volume to get the density

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  3. you could use a density can too

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  4. Hi Hannah. Thanks for this fantastic blog! Just one comment: I don't think the density of water changes at all in this experiment because the volume of water doesn't decrease if the mass stays the same. For example, water will occupy a greater depth in a container with a small length and width and vice-versa so the volume doesn't change.

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    Replies
    1. I was thinking the same thing- you can't really compress liquids

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