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diff --git a/2873/CH3/EX3.20/Ex3_20.sce b/2873/CH3/EX3.20/Ex3_20.sce
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+// Display mode
+mode(0);
+// Display warning for floating point exception
+ieee(1);
+clear;
+clc;
+disp("Engineering Thermodynamics by Onkar Singh Chapter 3 Example 20")
+v1=0;//initial volume of air inside bottle in m^3
+v2=0.5;//final volume of air inside bottle in m^3
+p=1.0135*10^5;//atmospheric pressure in pa
+disp("displacement work,W=p*(v1-v2)in N.m")
+W=p*(v1-v2)
+disp("so heat transfer(Q)in N.m")
+disp("Q=-W")
+Q=-W