Calculate the increase in internal energy of 1kg of water at 100 ∘C when it is converted into steam at the same temperature and at 1atm (100kPa). The density of water and steam are 1000kgm−3 and 0.6kgm−3 respectively. The latent heat of vapourisation of water =2.25×106Jkg−1

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Q2

In the video, they said that 1kwh is equal to 3.6*109 J

But, in the question and answer, they said that 1 kwh=3.6*106 J. So, Please tell me which is correct?

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Q3

How many signficant digits are there in 0.030100×106?

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Q4

How many significant figures are there in 0.030100×106?