LATA MANGESHKAR

Lata mangeshkar, the singer of 'Aei Mere Vatan.....' is nicknamed  'Swar samraagyi' (melody queen ) and 'Swar Kokila'. She was born on 28th september 1929 in a maharastrian family residing in Indore in madhya Pradesh. Her father Deenanath Mangeshkar was himself a noted classical singer and Theatre artist. Her mother's name was Shudhamati. The family's last name used to be Hardikar but Deenanath changed it to Mangeshkar in order to identify his family with his native town, Mangesh in Goa . Lata was named Hridaya at her birth. Her parents later renamed her Lata after a female character Latika in one of her father's plays. The famous singers Asha Bhonsle and Usha Mangeshkar are her younger sisters. Her younger brother Hridatanath is a well -known  music director . Meena is the Youngest sister.

Zeroth Law Of thermodynamics

 two bodies are said to be in thermal equilibrium if no transfer of heat takes place when they are placed in contact. We can now state the zeroth law of thermodynamics as follows :

              If two bodies A and B are in thermal equilibrium and A and C are also in thermal equilibrium then B and C are also in thermal equilibrium.

              It is a matter of observation and experience that is described in the zeroth law. It should not be taken as obvious. For example, if two persons A and B know each other and A and C know each other, it is not necessary that B and C know each other.

             the zeroth law allows us to introduce the concept of temperature to measure the hotness or coldness of a body. All bodies in thermal equilibrium are assigned equal temperature. A hotter body is assigned higher temperatures than a colder body. Thus, the temperature of two bodies decide the direction of heat flow when the two bodies are put in contact. heat flows from the body at higher temperature to the body at lower temperature.