1 Most children are familiar with chemical luminescence. If you have ever played with glow sticks then you can remember that bright glow. This is chemical luminescence. As a child, glow sticks fascinated :. I would bend them all simultaneously to create the brightest glow possible. Afterwards,
would spend what seemed like hours reading under my blanket with these toys. It was always disappointing when the glow ceased.
2 Scientists consider chemical luminescence a cold light because there is little temperature increase. The light emitted is the result of two chemicals
mixed together. As the chemical molecules combine, light is produced. In a glow stick, the two chemicals must remain separate until the consumer
wants to create the glow. To accomplish this, one chemical is sealed inside a thin glass tube. It is inserted into a larger plastic tube that can bend easily.
The space between the glass and plastic portions is filled with the second chemical. In this condition, glow sticks can remain stable for several years.
3 Glow sticks are common in amusement parks, novelty stores, and camping supply stores. Most glow sticks only work for a couple of hours. They
contain low amounts of the chemicals needed to maintain a long glow. However, larger glow sticks can maintain their chemical reaction for 12 hours or
more. This makes them perfect for night diving and evening strolls. The science of chemical luminescence even found its way into military use, Military
grade glow sticks have special light emissions that are only visible with infrared rays. From birthday parties to combat missions, glow sticks are
extremely versatile.
Smoke Alarms, by CPSC. gov
Smoke alarms save lives. They can detect a fire early, and alert consumers, giving them valuable time to escape.
Despite that well-known fact, about two-thirds of fire deaths take place in homes with no smoke alarms or no working smoke alarms, e., smoke alarms
with no batteries or dead batteries
When shopping for smoke alarms, consumers should consider the different types of smoke alarms. Both types are effective smoke sensors. Ionization
type detectors respond quickly to flaming fires, Photoelectric type detectors respond sooner to smoldering fires. Because both ionization and
photoelectric smoke alarms are better at detecting distinctly different yet potentially fatal fires, and because homeowners cannot predict what type of
fire might start in a home, CPSC staff recommends consumers install both ionization and photoelectric type smoke alarms in their homes. There are
smoke alarms that combine both detection technologies into one unit called dual sensor smoke alarms.
In addition, consider interconnected smoke alarms. Interconnected smoke alarms allow all smoke alarms in the home to sound if one has detected
smoke, and they may provide improved protection and offer more time to escape a fire.
Choose all the statements that accurately describe the organization and purpose of these two passages: "Luminescence' and 'Smoke Alarms