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3. gaseous
4. c, 273°c
5. c. sublimation
6. 273.15°c
7. Dry ice is the solid form of carbon dioxide. It is used primarily as a cooling agent.
8. dry ice, iodine
9. Evaporation is the process by which water changes from a liquid to a gas or vapor
10. Melting point, temperature at which the solid and liquid forms of a pure substance can exist in equilibrium
11. 1. Particles have inter-particle spaces between them.
2.Particles of matter attract each othe, which is strongest in case of solid, little less in case of liquid and least in case of gases.
3. State of matter which is closely packed diffuses slowly.
12. In hot summer days, When sweat from our body evaporates, it absorbs energy from our body and makes our body cool. Thus, it decreases our body temperature.
Thus sweating mechanism of human body is important to keep our body cool in summers and also when temperature of our body rises.
13. The characteristic of matter illustrated by this observation is that the particles of matter have spaces between them.
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