An ungraduated thermometer is fixed to a meter scale . its Mercury coloumn lies at 9cm for the ice points and 22.5 cm for the steam points . temperature of a mixture is measured using this thermometer. if length of Mercury coloumn be 7.5 cm abv ice point. the apx. temperature of the mixture will be ?
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Let the temperature in given scale be x.
Consider a straight line as a relation between given and celsius scale.
We get, 130−10x−10=100−040−0
where, 0 and 10 are lowest fixed point for celsius and given scale and 130 and 100 are highest fixed point for given and celsius scale.
⇒130−10x−10=10040
⇒100x−1000=4800
⇒100x=5800
⇒x=580
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