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Figure 4: Liquid water evaporation at 20°C from inside GT and SG. (a) Time dependent water evaporation from glass tubes (GT) with different inner diameters. (b) Polynomial fitting on the water evaporation rate in GT and the contact area of water to air. (c) Time dependent water evaporation from SG. (d) Corresponding contact area of water to air in SG according to the polynomial fitting. (e) Illustration of the contact area of water to air in glass tube and hollow sponge.