GRADE
States of Water
Water
exists in three states- solid, liquid, and gaseous.
This
is a K-5 Activity ---> For
Middle School and High School
Liquid Water-
Liquid
water is found in many places. You see liquid water coming out of the faucet,
when it rains, and running in a river. Pure liquid water is free of salt, rocks,
soil, and garbage.
Solid Water-
Ice,
snow, and frost are examples of water in the solid state. Liquid water freezes
at 0 degrees Celsius. Celsius is scale that measures temperature. What instrument
do you use to measure temperature? Winter is a season that you see a lot of solid
water. Other examples of solid water are ice cubes, icicles, ice on a skating
rink.
Water as a Gas -Look
at this picture of gas 
You
don't see anything because gas is invisible. Water in the
liquid state may change to water in the gaseous state. Water evaporates
to turn into a gas. Gases are colorless and odorless. You cannot see gas ,but
sometimes you can hear it and smell it. What are some ways that you can hear or
smell a gas? Water can evaporate or disappear with
the help of heat. Changes in temperature can increase the rate or how long
it takes water to evaporate. Evaporate means to disappear. Water can evaporate
from soil. It evaporates off wet clothes hanging on a clothesline. Plants release
water vapor into the air. We breathe out water vapor. TRY
THIS!!! 1. Dry your
hand with a towel. Feel your palm. Is it wet or dry?
2.
Hold your hand in front of your mouth about 1 inch away from you. Breathe out
slowly about 8 times on to the palm of your hand. Do not blow. When you are done,
feel your palm. What does it feel like? Is it wet or dry?
Your
palm should have felt wet to you. That moist feeling was water vapor. Remember
that we breathe out water vapor. If you have a dog or a cat, you can feel the
water vapor that they breathe out. Try this with a mirror. See the water droplets
form on the mirror. The water vapor that you breathed out is now becoming liquid
water on the mirror. Why?
Let's find out
why...What happens to water as it changes from a solid to a liquid to a gas?
The
changes from a solid to a liquid to a gas or from a gas to a liquid to a solid
are called a phase changes. When substances such as water change phase, its physical
properties change, but not its chemical properties. Melting, freezing, condensation,
and evaporation are examples of phase changes.The phase of a substance depends
on temperature and pressure. The pictures below show how molecules of water look
in each phase. Notice how solid water molecules are bunched together and how far
apart the gas molecules are.
to Chapter 4-Review Pages
and gif animations written and designed by Sheila M. Estacio. Please send comments,
praises, gripes, questions to sme2446@is2.nyu.edu