1. A differential scanning calorimetry (DSC) test was performed on a 25 mg polyethylene terephthalate (PET) sample taken from the screw-top of a soda bottle. The test was performed using a heating rate of 5 K/min (5 K rise every minute). The DSC output is presented in Fig. 4.27. Heat flow, Q 400 W/kg 200 100 0 -100 0 50 Heating rate=5 K/min 100 150 250 200 Temperature, T Figure 4.27 DSC scan of a PET bottle screw-top sample 'C 350