What is the value of the density of water at 4°C?  

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SSC JE Mechanical 9 Oct 2023 Shift 2 Official Paper-I
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  1. 10 gm/cm3
  2. 1000 gm/cm​3
  3. gm/cm​3
  4. 100 gm/cm​3

Answer (Detailed Solution Below)

Option 3 : 1 gm/cm​3
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Detailed Solution

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Explanation:

  • Water exhibits an anomalous behaviour; it contracts on heating between 0°C and 4°C.
  • The volume of a given amount of water decreases as it is cooled from room temperature until its temperature reaches 4°C. Below 4 °C, the volume increases, and therefore the density decreases.
  • This means that water has a maximum density (1 g/cm3) at 4°C.

KCET PHYSICS 2015    Trupti Jayesh Sunny 24.4.2020 1

  • As explained above due to anomalous behaviour of water when water is heated from 0° C to 10° C, then its volume first decreases and then increases although mass remains constant.
  • This can be represented as below

KCET PHYSICS 2015    Trupti Jayesh Sunny 24.4.2020 2

  • When water boils at a certain temperature it turns into steam. When it is cooled to a certain temperature it freezes and becomes ice.
  • Water boils at 100°C and freezes at 0°C.
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