Meaning of Temperature

Transcript

What is Temperature?It is a measure of hotness or coldness of a body Example 1 Freshly Made Tea Tea After Some Time It is hot (has higher Temperature) It is Cold (has lesser Temperature)Example 2 How do we adjust AC Temperature? When we feel Hot, we reduce Temperature When we feel Cold, we increase Temperature Example 3 Water during Summers Tap Water If we touch it This is Warm This has Highest Temperature Matka Water If we touch it This is Slightly Cold It has Medium Temperature Fridge Water If we touch it This is Cold This has Lowest Temperature Note We cannot always rely on touch to determine whether body is hot or cold Activity 7.1 :- Take three large containers and label them A, B and C, as shown in Fig. 7.1. Pour warm water in container A, tap water in B and ice cold water in C. We will conduct this activity in two parts — prediction and observation. Firstly, predict what will you feel if you — dip your right hand in A and left hand in C and keep them there for 1–2 minutes. — take out your hands from containers A and C, and place both hands simultaneously in B. Write down your predictions. — What will my right hand feel on dipping it in B? My right hand will feel warm on dipping it in B — What will my left hand feel on dipping it in B? My left hand will feel cold on dipping it in B Now, conduct the activity and write your observations. Observation – My right hand is feeling cold on dipping it in B My left hand is feeling warm on dipping it in B