A given mixture at room temperature (20°C) was heated. On a 15 minute duration of being subjected to heat, its temperature steadily increased and stopped changing at 50°C for about 20 minutes. However, the mixture's temperature increased again and eventually stopped at 100°C even after being heated for 30 minutes more as shown in figure 9. Why does the given mixture exhibit two constant temperature readings for a certain amount of time?
AYUSIN ANG SAGOT ​