Give the reason behind the following:
Sharp glass edge are heated for making them smooth.

Give the reason behind the following. Sharp glass edges are heated for making them smooth.

Give the reason behind the following. i) The glass window pannels of old buildings are thicker at the bottom than at the top.

Give reason for the following. Sky in the moon appears dark.

Give reasons for the following: Graphite is used as a lubricant in machines.

Give reason for the following case: The passengers are advised to remove ink from pen while going up in an aeroplane.

Give reasons for the following: Iron vessels are not used a boilers that are used to boil water.

Give reasons for the following: CO_2 is a gas whereas SiO_2 is a solid.

Give reasons for the following. Red light is used as signal lamps.

Give reason for the following: Halogen act as good oxidising agent.