1. Take a deep breath.
2. Get real close to the mirror or
window with your mouth.
3. Open your mouth and exhale your
hot breath onto the mirror or window.
has happened to the mirror or window?
It has steamed up or you could call
do things steam up?
If you breathe out on a mirror or window,
it will steam up.
Your breath contains water although
you can't see it.
The water is a type of gas,
called a vapor, which is mixed with
When the water vapor from your breath
hits the cold mirror or window some
of it turns into a liquid.
Thousands of tiny droplets of water
form on the mirror or window, and
this is called condensation or steam.
You may have seen steam or condensation
in the kitchen, the bathroom or in
a car on a cold day.
You can see this steam or condensation
in mid-air when you watch a kettle
or a pan of water boil or when you exhale outside on a very cold winters day.
Hot water vapors are given
off by the water.
The vapor cools when it meets
cooler air and then turns into tiny
(dew) drops, which forms the steam
To sum up why
things steam up?
If you breathe on a mirror,
the mirror steams up. Your breath
contains water – though you
cannot see it. The water is a type
of gas called a vapor, mixed with
the air. When the water vapor
from your breath hits the cold
mirror, some of it turns into a
liquid. Thousands of tiny droplets
of water form on the mirror, and
this is called condensation.
may have seen condensation in
the kitchen, the bathroom or in
Kitchen - steam escapes
from a boiled kettle, a hot oven
door being opened and lids when
lifted off a hot pot of cooking
Bathroom - steam is formed
when the hot water is being used
for taking a shower or a hot bath.
Car - steam is formed inside
a car on a cold day because it
is warmer inside the car.
you think of other places where
steam can be found?