Question

With all other parameters constant, the fabric with a low cover factor effectively transmits water vapor by a diffusion mechanism in comparison with that of fabric with a high cover factor due to \(\underline{\hspace{2cm}}\)

• A. More air space
• B. Less thickness
• C. High thickness
• D. Less air space

Hint:

Think about breathability: - Low Cover Factor = Open structure = Like a mesh or net = More air space = High breathability. - High Cover Factor = Dense structure = Like a solid sheet = Less air space = Low breathability.

Answer 1

The Correct Option is A

Step 1: Define "Cover Factor." Cover factor is a measure of how much of the area of a fabric is covered by yarn. A low cover factor means the yarns are spaced far apart, creating an open structure. A high cover factor means the yarns are packed tightly together, creating a dense structure.

Step 2: Understand water vapor transmission. This property relates to breathability. Water vapor (sweat) needs to be able to pass through the fabric from the skin to the outside to keep the wearer comfortable. This happens mainly by diffusion through the air gaps in the fabric.

Step 3: Relate cover factor to the fabric structure. A fabric with a low cover factor is more open and has larger interstices (gaps) between the yarns. This means it contains more air space. A fabric with a high cover factor is dense and has very little air space.

Step 4: Connect structure to function. Water vapor diffuses much more easily through air than through a solid fiber. Therefore, the fabric with more air space (the one with the low cover factor) will allow for much faster and more effective transmission of water vapor.