1. The glass of the thermometer is thick..the hot water will cause uneven expansion on the glass this making it to break

    The glass of the thermometer is thick..the hot water will cause uneven expansion on the glass this making it to break

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  2. Lubricating the moving parts And making sure that the moving parts that have to be lifted are not very heavy

    Lubricating the moving parts
    And making sure that the moving parts that have to be lifted are not very heavy

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  3. This answer was edited.

    Density =mass/volume. So you need to measure the mass of the solid Use displacement method to measure it's volume i.e. put some water in a measuring cylinder . Note the volume of the water say V1, gently lower the irregular solid into the water and note the new volume reached as V2. Then the volumeRead more

    Density =mass/volume.
    So you need to measure the mass of the solid
    Use displacement method to measure it’s volume i.e. put some water in a measuring cylinder . Note the volume of the water say V1, gently lower the irregular solid into the water and note the new volume reached as V2.
    Then the volume of the solid will be V2-V1. In this, we assume that the solid will fit into the measuring cylinder.

    So density of solid will be
    Mass/[V2-V1]

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