The temperature of two bodies measured by a thermometer are t1= 20°c +-0.5°c and t2=50°c+-0.5°c . Calculate the temperature difference and error their in
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t' = t₂ - t₁ = ( 50° C ± 0.5° ) - ( 20° C ± 0.5° )
t' = 30° C ± 1° C
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