Textophobia
It varies by balloon. If the balloon is spherical, the circumference is pi times the diameter. If you are asking what the skin is made of, it is usually coated, very light fabric.
A gore on a hot air balloon is a section of lightweight fabric that makes one of the panels of the balloon. The gores are cut from flat material and stitched together to give the balloon its shape.
I presume you mean without an airborne heater. The answer is, there is no fixed time! It could range from a few minutes to the best part of a day. It all depends on the rate the balloon loses heat, which in turn depends on the size of the balloon, the weight of the balloon, the insulation and porosity properties of the balloon fabric, and the amount of solar heating, if any, that it receives.
It needs to be open at the bottom to get heat from the burners into the balloon to warm up the air and decrease its density. If you sealed it off, eventually heat exchange through the fabric of the balloon would could the air off enough that the balloon would no longer be bouyant and it would lose altitute.
You can use a combination of things like heavy duty lining for the curtain fabric, interior or exterior blinds, interior or exterior shutters, a reflective film on the window glass. For comprehensive details see this article: http://www.helium.com/items/1714551-how-to-protect-curtains-and-drapes-from-sun-damage
You can make the long tie strips out of the curtain fabric or purchase ribbon. Attach a strip to the front and back side of the curtain at the top. It depends on the width of your curtain how far in from the edge to attach the tie. You want to go in several inches, so you get the balloon look. Do this on both ends. Now gather up the fabric and tie a pretty bow at the bottom and your're done.
Fabric shower curtains have a better look to them than the cheap appearing plastic curtains. But be aware, fabric curtains do need to be washed or they will smell terrible.
Curtains can be made with a sewing machine fabric, and thread. One should find a pattern for curtains in a fabric store and follow the pattern to make the curtains.
Amazon is a terrific resource to find yourself curtains to purchase for your bathroom. They have tons of fabric shower curtains to choose from at the right price for you.
Curtains are made of different types of fabric, sewed together.
About 11-12 yards
There are a few advantages of curtains made out of acrylic fabric:Acrylic fabric is wrinkle resistantAcrylic fabric is fire resistantAcrylic fabric is easier to care for and clean
Washing chenille curtains in machine will be suicidal for the fabric, as it tends to disperse and shed loops of fabric in water. Chenille curtains is recommended to be hand washed only.
No, not if they're just regular fabric curtains.
Velour
Yes you can go to your local fabric store to get a perfect match for your curtains
Curtains/Drapes, can be made from cotton, linen, or wool.