It is done by taking advantage of one of two facts: firstly that the electrical resistance at the junction of two different metals (a thermocouple) varies according to the temperature, and secondly that the volume of a body varies with its temperature. In the first case a constant voltage is applied to the junction of the two metals, and the resulting current is measured with an ammeter calibrated in degrees of temperature; as the temperature at the junction varies, so will the current flowing and therefore the indicating hand on the dial of the instrument. The distance between the thermocouple and the indicator is immaterial, and this form of measurement is very suited to remote temperature reading.

My mother has got dark(light black) hair .She is beautiful. Her height is about 1.80 centimeters . She works as a assistant manager. Her brows are light brown.
My father has got dark hair and dark brows. He is 50 years old .He has his own business and he wors as a seller .His height is 1.40 centimeters. My father is kind .
I am Sergey. I am 17 years old .I am a student of technical college. My height is 1.80 centimeters.
I have got light brown soft hair .I have a round face .I have my own little business and scholarship is as addition for me . I am sure that i will get red diploma.

Hello. Let me introduce my family.
 My name is Sergey and I have beautiful parents : the mother and father.
  My mother is a very nice woman.She has fair-black hair and fair-brown eyebrows. Her height is about 130 centimetres. She  work a deputy of  manager.
My father is  a kind man. He has black hair as well as eyebrows. He is fifty yeats old. His height is 140 centimetres. He is a seller. He also hasd a business.
And now I, Sergey. I am seventeen years old. I study at a technical school in the group 52E. My height is 180 centimetres. I have soft fair-brown hair. Me face is round. I have my own little business, so the studentship is addition for me. I am sure that i will graduate my studiyng with honor. 

Не сказал как звать родителей. (Если что допишешь- My father`s name is (oleg). My mother`s name is Sveta  )
Также не сказал сколько лет маме. Тогда будет She is (35) thirty-five years old. 
 В остальном все хорошо!)