Page 121 - Abstract book - TJSSF-2020

Thailand – Japan Student Science Fair 2020 (TJ-SSF 2020)
“Seeding Innovations through Fostering Thailand – Japan Youth Friendship”

The Soundproofing Effects of Different Thicknesses of Air Layers

Kaito Mori
1
Advisor: Sinya Kato
1

Tokai University Takanawadai Senior High School
1

Abstract
We were inspired by double-glazed windows to investigate how thick the air layer needed to be to have
a soundproofing effect. We expected that a thick layer of air could block more sound. In this experiment,
we created different layers of air by using six different sized boxes, a base box, and five boxes that were
1cm longer, wider, and deeper than each previous one. Then, we compared their soundproofing ability.
First, we blocked the sounds by using the five boxes we made. The sounds became louder at one
frequency of sound. So, we tested different frequencies on the boxes we made and found that 500Hz,
1600Hz, and 2450Hz sounds did not cause resonance. Then, different thicknesses of air were tested at
these three frequencies by using the base box and putting one of the other boxes over it. The results
showed when the layer of air is 3cm and 5cm, it could only block the 500Hz sound a little. Also, when
the layer of air is 1cm, the loudness was the same for 1600Hz and 2450Hz sounds. Finally, when the
layer of air is 7cm and 9cm, it can block sound in all three frequencies.

Keywords: air layer, soundproofing effect, Hz, resonance

109