What's New Have you ever experienced having a fever? You usually touch your forehead or neck to check if you have a fever or not. You use your sense of touch to tell whether an object is hot or cold or one is hotter or colder than the other. When bathing a baby. you dip your fingers in the water, and when you prepare baby's milk, you sprinkle a few drops of milk on your wrist to check if the temperature is just right. When you are about to fry some food, you sprinkle some water to see if the frying pan is already hot. When you feel you are warm, you often say you have a high temperature. When an object is cold, you often say it has a low temperature. Temperature is commonly associated with coldness or hotness of a body. How do we quantify this difference in the hotness or coldness of a body? You might have experienced that your mother checked your temperature by putting a small glass tube or a digital device called a thermometer in your underarm. 1. Look at the data below obtained in an experiment where 200 mL of pure water is heated and boiled. 2. Observe what happens to the temperature as the water is being heated. TIME (min) 0 1 21 2 3 Temperature of 200 mL heated and boiled water at a particular time TEMPERATURE TIME TEMPERATURE TIME TEMPERATURE (°C) (min) (°C) (min) (°C) 30 10 20 79 32 11 80 34 12 58 22 83 35 13 60 23 86 38 14. 62 88 41 15 64 25 90 44 16 66 26 94 46 69 27 96 48 18 74 28 98 51 19 76 29 100 water boils 4. 5 6 7 8 9 Source: OHSP Module 13 Transit Energies: Heat and Work, p. 6 3. Answer the following questions: A. What happens to the temperature of water as time elapses? B. What is the temperature when the water boils? C. What happens to the temperature of water while it is boiling? ​