Heat and Temperature

Content:  Heat and Temperature 

       Heat is a form of energy. It flows from one place to another and it is useful in our day to day activities.

       Temperature is the degree of hotness or coldness of a substance. It tells how cold or warm out body is. It is measured with thermometer in degree . 

Heat causes a change in temperature.

Difference between Heat and Temperature 

          Heat.                            Temperature 

1. Heat is a form of.           Temperature is a 

energy                               quality or property of 

                                             Object .

2. Heat causes change.      Temperature is the

    In degree of                      heat generated.

 temperature.

3. Metric unit of meas-       Temperature is mea-

urement of heat is                sured in degree 

Calorie in CGS and               Celsius,or Kelvin or

Joule in SI.                              degree Fahrenheit.

4. Heat is obtained.               Temperature is 

from solar energy,                 obtained when

chemical energy, and.          substance is heated

mechanical energy                 or cooled.

5. Heat is the change.            Temperature deter-

that flows.                                mines the direction                                                     of the heat flow.

               Types of Thermometer   

There are many types of thermometer . Some of them are 

I. Liquid -in- glass thermometer : e.g Mercury -in- glass thermometer, Alcohol -in- glass thermometer.

2. Maximum and minimum thermometer 

3. Clinical thermometer: A clinical thermometer is used in hospitals to measure body temperature.The graduation in the clinical thermometer ranges from 35.0°C to 42.0°C. The normal body temperature is 37.0°C.

4. Digital thermometer: It measure temperature with electronic sensor.

The most commonly used thermometer are the mercury and digital thermometer.

             Units and Syyof Temperature Scales

Unit of Temperature 

The unit of measuring temperature on the Celsius scale is 0°C ( degree Celsius)

The unit of measuring temperature on the Fahrenheit scale is °F ( degree Fahrenheit)

The unit of measuring temperature on the Kelvin scale is K.

         Symbols of Temperature Scale

There are many temperature scales. The commonly used ones are 

1. Celsius scale 

The Celsius is from 0°C to 100°C. 0°C is the lowest fixed point (the temperature of pure water) , while the temperature of pure steam ( upper fixed point) is 100°C.

2. Fahrenheit Scale

The temperature of pure ice ( lower fixed point) on a Fahrenheit scale is 32°F, while the upper fixed point (the temperature of pure steam) is 212°F. This means that Fahrenheit scale is from 32°F.

3. Kelvin Scale

The lowest fixed point on a Kelvin scale ( temperature of pure ice) is 273K while the temperature of pure steam ( upper fixed point) is 373K. This means that Kelvin scale is from 273K to 373K.