Removal of inside air and supply of fresh outside air in a closed room is known as _____

A ___________ is produced when part of the atmosphere is compressed suddenly.

Reverberation time is independent of the shape of the room.

The average height for small halls should be _____

Sound travels faster in gases than in solids.

Hard materials used for sound insulation are good absorbers.

Where people are working, there has to be __________ to cause proper ventilation of the premises.

In __________ system, the partial vacuum is created inside of the room by exhausting the vitiated inside air by fans or …