Question 2
1.Thermal energy flows between objects due to difference in___________
2.When a liquid is heated it___________
3.Convection current gives rise to ___________
4.Dark colours are good___________ of heat.
5.The degree of hotness or coldness in a substance is called ___________
6.___________ is a conductor of heat.
7.The thermos flask is made up of double walled glass vessels because glass is a ___________
8.In solids transfer of heat can take place by ___________
9.Mercury is a liquid metal in ___________
10.The form of energy that flows from hot object to a cold object is called ___________
11.The boiling point of water in the Celsius scale is ___________
12.The transfer of energy between object that are in physical contact is by ___________
13.The ___________ in a clinical thermometer prevents backflow of the Mercury into the bulb.
14.The handle of cooking utensils are made of material that are___________
15.The vacuum in a thermos flask reduces the heat loss due to___________
Answers
Answer:
hii
Explanation:
1. temperatures
2. starts to expand
4. absorber
5. temperature
6. metals
Answer:
1. Thermal energy flows between objects due to differences in temperature.
Explanation: When there is a difference in temperature between two objectsthen the heat flows from anobject with a higher temperature to the object with lower temperature. For example, a cup of warm water has less energythan a tub of warm water.
2.
As the liquid is heated the the kinetic energy of the molecules increase and they liquid starts to expand. When the temperature reaches the boiling point of theliquid it starts boiling the phase changes from liquid to gaseous.
3.Convection currents form because a heated fluid expands, becoming less dense. the less dense heated fluid rises away from the heat source. as it rises it pulls cooler fluid down to replace it . this fluid in turn is heated, rises and pulls down more cool fluid.
4. CONDUCTORS
5. The degree of hotness or coldness of any substance is called Temperature. ... The degree or intensity of heatpresent in a substance or object; especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch. It is measured by thermometer.
6. IRON
7. The thermos flask is made up of double walled glass vessels because glass is a poor conductor of heat. The thermos flask consists of a double-walled glass vessel which rests inside a metal or plastic case on a cork. The inner wall's external surface and its outer wall's inner surface are silvered.
8.