Question

write the three properties of air in minimising friction on the smooth ride of a hovercraft
difference between lignite and anthracite on the basis of their carbon content and moisture

Answer 1

Answer:

difference between lignite and anthracite are-

lignite has about 60-70% carbon content.It content large number of moisture .It is the softest and the lowest quality of coal having the least heating value...

anthracite has above 85% carbon content . It has least moisture content .It is used in steam engines,furnaces and as household fuel

Answer 2

Answer:

the 3 properties are

nature of the fluid

shape of the moving object

speed of the moving object