| The
Basics
You can find a hair dryer like
this one in almost any drug or discount store. This model
has two switches, one to turn it on and off and one to control
the rate of airflow. Some models have an extra switch that
also lets you regulate the temperature of the airflow.
The hair dryer dries your hair by speeding
up the evaporation of water from the hair's surface. The hot
air emitted from a hair dryer increases the temperature of
the air surrounding each strand of hair. Since warm air can
contain more moisture than air at room temperature, more water
can move from your hair into the air. The increase in temperature
also makes it easier for the individual molecules in a water
droplet to overcome their attraction to one another and move
from a liquid to a gas state.
Hair dryers were first sold in the 1920s.
Since then, thousands of patents have been issued for different
hair dryer designs, but most of them only tweak the outside
packaging of the hairdryer so that it looks more aesthetically
appealing to you. Aside from the addition of some safety features,
the inside of a hair dryer hasn't changed too much over the
years.
A hair dryer needs only two parts to generate
the blast of hot air that dries your hair:
* a simple motor-driven fan
* a heating coil
Hair dryers use the motor-driven fan and the
heating coil to transform electric energy into convective
heat. The whole mechanism is really simple:
1. When you plug in the hair dryer and turn
the switch to "on," current flows through the hair
dryer.
2. The circuit first supplies power to the bare, coiled wire
of the heating element, which becomes hot.
3. The current then makes the small electric motor spin, which
turns the fan.
4. The airflow generated by the fan is directed down the barrel
of the hairdryer, over and through the heating element.
5. As the air flows over and through the heated coil, heat
risingning around the hair dryer's heating element. The wire
in the element is fragile and can break easily.
Always unplug your hair dryer before working on it to avoid
electric shock.
What
is ionic hair dryer? | Travel
hair dryer | 7
Tips For Great Results | The
Right Hair Dryer |
How
hair dryers work | Before
Choosing a Hair Dryer | Salon
Style... From Your Hair Dryer? |
Top
Tips For Choosing The Right Hair Dryer
|
