I am trying to find an fire alarm (include smoke alarm) for the dorm and home as well. I don't respond to fire alarm strobe at all or hear a thing. For the dorm, they want to find one to accommodate my needs for fire alarm and I requested a vibration for fire alarm. They claimed the ones ADA provides them is a weak one, so it wouldn't work for me. I'm trying to find one that might work for me and be able to connect to all of the other fire alarm in the dorm. Is there any like that?
This is the reverse of usual! Normally exchange resins are used eg to remove Ca and Mg ions (water hardness) then regenerated with salt NaCL providing sodium ions. So you could run a strong solution of calcium chloride through the resin.
Water is the most familiar extinguishing material, and it is one of the most effective. But it can be dangerous in the wrong situation. A water extinguisher can put out things like burning wood, paper or cardboard, but it does not work well on electrical fires or fires involving inflammable liquids. In an electrical fire, the water may conduct the current, which can electrocute you. Water will only spread out an inflammable liquid, which will most likely make the fire worse. The colr is usually food coloring which is red in this case. One popular extinguisher material is pure carbon dioxide. In a carbon dioxide extinguisher, the carbon dioxide is kept in pressurized liquid form in the cylinder. When the container is opened, the carbon dioxide expands to form a gas in the atmosphere. Carbon dioxide gas is heavier than oxygen, so it displaces the oxygen surrounding the burning fuel. This sort of fire extinguisher is common in restaurants because it won't contaminate the cooking equipment or food. The most popular extinguisher material is dry chemical foam or powder, typically made of sodium bicarbonate (normal baking soda), potassium bicarbonate (nearly identical to baking soda), or monoammonium phosphate. Baking soda starts to decompose at only 158 degrees Fahrenheit (70 degrees Celsius), and when it decomposes, it releases carbon dioxide. The carbon dioxide, along with the insulation of the foam, works to smother the fire. Most fire extinguishers contain a fairly small amount of fire-suppressant material you can use it all up in a matter of seconds. For this reason, extinguishers are only effective on relatively small, contained fires. To put out a larger fire, you need much bigger equipment a fire engine, for example and the professionals who know how to use it. But for the dangerous flames that can pop up in your house, a fire extinguisher is an invaluable lifesaver.
