different fabrics need different amounts of heat. thinner fabrics tend to be more delicate, so a higher heat setting would damage them, wheras heavier fabrics need more heat to smooth wrinkles effectively. if you have an iron with steaming capabilities, settings can adjust whether or not (and how much) the steam is on.
however high the settings can go on the iron
No, this particular flat iron only offers an on/off switch with one general temperature setting for all.
They probably have different settings for different songs.
iron bending different from iron rusting
what are the causes different time settings parts of thw world
There are no best settings it's all a matter of opinion I would use different settings for different moods and themes.
My Black & Decker Sure Steam iron has a chart on it with suggested settings for different fabrics, and it has a setting for nylon (the second to lowest setting) and suggests not using steam, just a dry iron. I have a 100% nylon mesh blouse that I ironed on this setting, and put a cloth napkin over the area I was ironing to be safe and had no problems.
hamilton Beach has different varities and has the most settings
By one at a local CVS store that is around $20, it black and orange/yellow. It's very good. 25 different settings, and it heats up in 7 seconds.
the angle of the head is different. A 3 iron is not much of an angle, and a 9 iron is like at 50 degrees or so
Density and melting point are different.
When selecting a curling iron you need to consider many factors including your hair type and desired curl size. Curling irons come in many different heat settings and sizes. I would suggest a non-professional iron (since they typically have a non-spring loaded clamp and are hard to master).