What are the source of error in determination of boiling point and melting point

Experimental error is the source of error in determination of boiling point and melting point.

Errors in the boiling and melting point measurement occurs due to experimental errors such as heating the water bath too rapidly, poor alignment of the thermometer and sample.

These errors can leads to providing false data about the boiling and melting point of a substance so we can conclude that experimental error is the source of error in determination of boiling point and melting point.

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when the volume of gas is   changed from   717.73 ml   to 852 ml   the temperature will   change   from 315   c to 452   c

    calculation

this is calculated using the charles law formula

that is,   v1/t1 = v2/t2

          v1=?

        t1 = 315 c   into   kelvin = 315 +273 = 588 k

        v2 = 852   ml

        t2 = 425c + 273 =698 k

make v1   the subject of the formula ( by   multiplying both side by t1)

  v1=( v2 xt1) / t2

v1= (852 ml   x 588 k)/ 698 k= 717.73 ml