I.C. engine
air preheaters
heating of building in winter
none of the above.
change vapour into liquid
change liquid into vapour
increase the temperature of a liquid or vapour
convert water into steam and superheat it
free electrons
atoms colliding frequency
low density
porous body
increases
decreases
remains constant
may increase or decrease depending on temperature
0.1
0.23
0.42
0.51