Calculate the temperature difference and the error in calculation if the two temperatures are given asT1=20∘C±0.5∘C and T2=50∘C±0.5∘C.

Here,t1−20∘C±0.5∘C;t2=50∘C±0.5∘CThe temperature difference of two bodies ist=t1−t1=50∘C−20∘C=30∘CThe error in temperature difference is given byΔt=Δt1+Δt2=0.5∘C+0.5∘C=1∘CThe temperature difference is30∘C±1∘C.