7. The boiling point of oxygen is -183°C. Its value on Kelvin scale is .......... .
8. The three states of water can be interconverted by a change in ........... .
9. The melting and freezing points of a substance are ......... .
10. Evaporation is a ........... process and takes place.......... at .......... temperatures.
11. Boiling of a liquid is a ........... phenomenon.
12. The substances which undergo sublimation possess very .......... forces of .............. between their particular
13. A gas can be liquefied by ........... pressure and .......... temperature.
14. Solid carbon dioxide is called ............... pressure and temperature. because of melting it changes into the .......... .
15. A fluorescent tube on passing electric current gives a bright glow due to formation of ........... .
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