*A thermal conductor is a material through which thermal energy flows easily.

Explanation: The rest of the given will burn so I think Metal is the best choice.

Copper is an extremely good conductor of heat, which means heat moves through copper cookware and is transferred to the food quickly. By comparison, water or even stainless steel are relatively poor conductors of heat.

Cellulose, a fiber insulation material with a high recycled content, is blown into a home attic. Insulation materials run the gamut from bulky fiber materials such as fiberglass, rock and slag wool, cellulose, and natural fibers to rigid foam boards to sleek foils.

Vacuum insulated panels have the highest R-value, approximately R-45 (in U.S. units) per inch; aerogel has the next highest R-value (about R-10 to R-30 per inch), followed by polyurethane (PUR) and phenolic foam insulations with R-7 per inch.

Boiling does kill any bacteria active at the time, including E. coli and salmonella. But a number of survivalist species of bacteria are able to form inactive seedlike spores.

Filtration by itself does not purify water. It must be followed by boiling or disinfection to purify water for drinking. Most water filters are made of a screen with many tiny holes in it. These filters can remove protozoa and some bacteria, but they cannot filter out viruses because viruses are too small.

Boiling is a very simple method of water disinfection. Heating water to a high temperature, 100°C, kills most of the pathogenic organisms, particularly viruses and bacteria causing waterborne diseases. In order for boiling to be most effective, the water must boil for at least 20 minutes.

1 minute

The water helps create soap lather that removes germs from your skin when you wash your hands. Water itself does not usually kill germs; to kill germs, water would need to be hot enough to scald your hands.

If a handwashing station is available, wash your hands with soap and water instead. After blowing your nose, coughing, or sneezing, you should clean your hands by immediately washing your hands with soap or using alcohol-based hand sanitizer to avoid spreading germs.

Drinking even a small amount of hand sanitizer can cause alcohol poisoning in children. (But there is no need to be concerned if your children eat with or lick their hands after using hand sanitizer.)

You don’t want to wash your hands in scalding hot water, and warm water works just as well. The oils on your hands hold bacteria and germs, and warm water and soap is effective enough to remove them. Warm water also trumps cold water, which is less effective at removing oils and germs.

Washing your hands in hot water may be pointless as scientists have found that cold water is equally effective at killing germs. Researchers also found that washing even for 10 seconds significantly removed bacteria from the hands.

Not all stains respond to warmer water. For example, blood and sweat can actually set into fabric in hot water. Also, hot water tends to shrink, fade, and wrinkle certain fabrics. By not heating the water in your washing machine, you may reduce your energy costs with every load.

—Use soap. Before applying soap to your hands, run water over them. Soap and water together, with rubbing, is what helps rinse organisms off your hands and down the drain. Don’t worry about removing hand jewelry, Dr. Larson says.

The most hygienic way to dry is with paper or cloth towels, Wahrman said. “Research studies show that drying with paper towels or cloth towels removes even more germs than washing alone, as the friction of drying reduces the germ count even further,” she said.

You Pass on Germs If you don’t wash your hands when they’re germy, you could pass those germs to friends and family and get them sick. If you get them on an object — like a doorknob or handrail — you could infect people you don’t even know. Make sure to lather up after you use the bathroom.