Chapter 1, Problem 1.12P

Interpretation Introduction

(a)

Interpretation:

The reason for which the aluminium is used for airplane bodies is to be explained.

Concept Introduction:

Aluminum is soft, non-magnetic and ductile metal which also forms an alloy by melting with copper silicon.

Interpretation Introduction

(b)

Interpretation:

The reason for polyurethane to be used for alignment of teeth is to be explained.

Concept Introduction:

Polyurethane is a polymer made up of organic units by combining units of urethane. The polyurethane is a thermosetting polymer which does not melt on heating.

Interpretation Introduction

(c)

Interpretation:

The properties of steel making it useful for ball bearing in the bicycles wheel hub are to be explained.

Concept Introduction:

Steel is one of the important engineering and construction materials. It is an alloy of iron and carbon where, carbon is less than 1%.

Interpretation Introduction

(d)

Interpretation:

The reason behind using polyurethane terephthalate for water bottles is to be explained.

Concept Introduction:

Polyurethane terephthalate is the most common thermoplastic polymer used in containers for liquids and foods. It is strong, lightweight plastic used in storage containers for foods and beverages, soft drinks, water, etc.

Interpretation Introduction

(e)

Interpretation:

The reason for the wine bottles to be made up of glass is to be explained.

Concept Introduction:

Glass bottles are chemical free, hence, there is no chemical leeching. They are easy to clean. Glass does not react with any other substance.