The Granite Tower
Why Are Beverage Cans Cylinder-Shaped?
Bae Mi Seon  |
폰트키우기 폰트줄이기 프린트하기 메일보내기 신고하기
승인 2012.10.28  22:23:44
트위터 페이스북 미투데이 요즘 네이버 구글 msn


 Let us start with the question,
“Why is the bottom of a can a circle?”
Consider a circle, a square and an equilateral triangle
of the same circumference (perimeter), say 4π.

A circle has the largest area compared with that of other shapes. Here, we can infer that a can has the largest volume when it is a cylinder with a circle-shaped base for a fixed height. In other words, more contents can be held in a cylinder.

Say a company wants to put X-amount of a drink in each package and we can change the height of the container this time. We find that a cylinder with the base of a circle has the smallest surface area given the same circumference of the base. Usually, the cost of producing packaging for a drink is about three times greater than to cost of the contents. Less material used in the packaging means bigger profits for the company.
Now, is a cylinder the most practical and economical shape for a can? If we consider a sphere, it can hold a large volume of content compared with a cylinder. However, it becomes much harder to store products when the container is sphere shaped because it will not stay in one place. So most economical - no, most practical - yes.

Last, but not least, “Why is a can’s bottom arch-shaped?” This is especially important for fizzy drinks. Here we introduce some chemical theory. It is arch-shaped so that an explosion of carbon dioxide due to gas expansion when the temperature rises can be prevented. Many people are unwilling to buy milk packages that are bulging. Even if the contents remain fresh, maintaining the shape of the container will increase the salability of product.
폰트키우기 폰트줄이기 프린트하기 메일보내기 신고하기
트위터 페이스북 미투데이 요즘 네이버 구글 msn 뒤로가기 위로가기
이 기사에 대한 댓글 이야기 (0)
자동등록방지용 코드를 입력하세요!   
- 200자까지 쓰실 수 있습니다. (현재 0 byte / 최대 400byte)
- 욕설등 인신공격성 글은 삭제 합니다. [운영원칙]
이 기사에 대한 댓글 이야기 (0)
About UsCurrent StaffNotice BoardFree BoardArchive
EDITORIAL OFFICE The Granite Tower, Anam-dong 5Ga, Seongbuk-gu, Seoul, Korea (136-701)  |  TEL 02)3290-1685, 82-2)3290-1685
Copyright © 2011 The Granite Tower. All rights reserved. mail to