Condensation Definition
Condensation is a change in the state of water from a gas or vapor form into liquid form. It generally
happens when vapor in warm air encounters a cool surface. But condensation doesn't need a solid
surface to take place, as it can occur when a warm pocket of water vapor encounters colder gasses.
common examples of condensation are:
1. Morning dew, when moisture in the air condenses on the grasses cooled during the night.
2. Droplets on your can of soda. The cold surface of the can causes moisture in the warm exterior air to condense
on the outside of the can.
3. A foggy windshield. The air in your car contains moisture, and more is added from the breath and bodies of
passengers. With enough moisture, and a cool enough windshield, the moisture condenses as droplets that fog
your window.
4. A foggy mirror. The same thing happens in your bathroom when shower moisture condenses on a cool mirror.
5. Foggy breath. Can you see your breath? Then it's cold outside; cold enough to condense moisture into larger
droplets. This is an example of condensation occurring without a surface to collect the drops.
6. Clouds. The clouds in the sky are another example of condensation without a surface.
Melting definition
Melting definition is a process that causes a substance to change from a solid to a liquid. Melting occurs when
the molecules of a solid speed up enough that the motion overcomes the attractions so that the molecules can
move past each other as a liquid.
Examples of Solid to Liquid (Melting)
1. Solid to liquid - Melting occurs when something that is solid turns back into a liquid; it is the opposite of
freezing.
2. Ice to water - Ice melts back into water when it is left out at temperatures above the freezing point of 32
degrees.
3. Rocks to lava - Rocks in volcanoes can be heated until they are molten lava.
4. Metal to molten liquid - Metals such as steel and bronze can be molten down. They can also be reformed as
solids.
1. Purity Analysis of Ghee/Butter : Heat Test, Palm Test, Double-Boiler Method
2. Ice Skating
3. Alloy Formation - Super-alloys- Steel Melting
4. Light Bulbs
5. Sugars - Melting Sugars
6. Glass Melting
7. Coin Melting
8. Snow Melting
9. Wax Melts
10. Metal that melts into your Palm - Gallium is an unexpected metal that melts in the palm of your hand. Its melting
point is relatively low, i.e., 85.6°F, and just the heat of your palm is able to melt it. This property makes gallium
ideal for recording high-temperature thermometers.
Freezing is a phase transition phenomenon, in which a liquid state of a given substance is changed to a
solid-state. It is also known as “solidification”.
The most common example of freezing, which is observed every day, is the formation of ice cubes in ice-
tray when water is kept in the freezer for some time.
Examples
1. Snowfall
Snowflakes
2. Sea Ice
3. Frozen Food
4. Lava Hardening into Solid Rock
5. Solidification of Melted Candle Wax
8. Congealing of Bacon Grease
Examples of Liquid to Solid Phase Transition (Freezing)
1. Water to ice - Water becomes cold enough that it turns into ice. In fact, every known liquid (except for helium)
is known to freeze in low enough temperatures.
2. Liquid to crystals - Most liquids freeze by a process that is known as "crystallization," whereby the liquid forms
into what is known in the scientific world as a "crystalline solid."
Evaporation happens when a liquid turns into a gas. It can be easily visualized when rain puddles
“disappear” on a hot day or when wet clothes dry in the sun. In these examples, the liquid water is not
actually vanishing—it is evaporating into a gas, called water vapor.
Evaporation from the oceans is vital to the production of fresh water. Because more than 70 percent
of the Earth’s surface is covered by oceans, they are the major source of water in the atmosphere. When
that water evaporates, the salt is left behind. The fresh-water vapor then condenses into clouds, many of
which drift over land. Precipitation from those clouds fills lakes, rivers, and streams with fresh water.
13 Everyday Life Examples of Evaporation
1. Drying Clothes under The Sun. ...
2. Ironing of Clothes. ...
3. Cooling Down of Hot Tea and Other Hot Liquids. ...
4. Wet Floors. ...
5. Melting of Ice Cubes. ...
6. Preparation of Common Salt. ...
7. Evaporation of Nail Paint Remover. ...
8. Drying of Wet Hair.
When an object is a solid, its molecules are arranged in a pattern and can't move around much. In a liquid,
molecules are farther apart, can move around, and are not arranged in a pattern. Water is unique
because the properties of water allow it to exist in all three states of matter! …
Chemical and Physical Changes of Matter
Matter changes form but not identity in a physical change. A chemical reaction occurs and a new product is
formed in a chemical change.
1.If you are confused about chemical and physical changes and how to tell them apart, you’ve come to the
right place. Chemical and physical changes both are changes in the structure of matter. In a chemical
change, a chemical reaction occurs and a new substance is produced. In a physical change, matter changes
forms but does not change its chemical identity. So, the difference between chemical and physical changes
is that a chemical change alters the chemical composition of matter, while a physical change does not.
Chemical Changes
2.A chemical change involves a chemical reaction to produce a new product. It is a change at the molecular
level of matter. Chemical bonds between atoms break and then form to connect different atoms.
Examples of Chemical Changes
3.In a chemical change, new product forms as atoms rearrange themselves. Chemical bonds are broken and
reform to make new molecules. Examples of chemical changes include:
Souring milk
Digesting food
Cooking an egg
Baking a cake
Rusting iron
Mixing an acid and a base
Burning a candle
Mixing baking soda and vinegar
Physical Changes
4.A physical change is a change in matter that alters its form but not its chemical identity. The size or shape
of matter often changes, but there is no chemical reaction. Phase changes are physical changes. These
include melting, boiling, vaporization, freezing, sublimation and deposition. Breaking, crumpling, or
molding matter also results in a physical change. Many physical changes are reversible.
Examples of Physical Changes
5.Examples of physical changes include:
Melting an ice cube
Freezing an egg
Boiling water
Sublimation of dry ice into carbon dioxide gas
Shredding paper
Crushing a can
Breaking a bottle
Chopping vegetables
Mixing sand and salt
Making sugar crystals
Dissolving sugar in water (the sugar mixes with the water, but can be recovered by evaporation or
boiling)
How to Tell Chemical and Physical Changes Apart
6.The key to distinguishing between chemical and physical changes is determining whether there is a new
substance that wasn’t there before. If you see signs of a chemical reaction, it’s probably a chemical change.
Signs of a reaction include:
Temperature change
Light
Color change
Bubbling
Odor
Sound
Formation of a precipitate
7.If none of these signs are present, it’s a good bet a physical change occurred.
Are Physical Changes Reversible?
8.Some people use reversibility as a test for chemical and physical changes. The premise is that a physical
change can be undone, while a chemical change can only be reversed by another chemical reaction. This is
not a great test because there are too many exceptions. While you can melt and freeze an ice cube (a
physical change), it’s much harder to reassemble shredded paper (another physical change).
9.Most physical changes can be reversed if energy is added. Some chemical changes are reversible, but only
via another chemical reaction. For example, rusting of iron is a chemical change. Converting rust back into
iron and oxygen is possible, but it requires a chemical reaction
Main Difference Between a Chemical and Physical Change
Chemical and physical changes happen all the time in our everyday lives. But how can you tell if an item or
substance has undergone a chemical change or a physical change, and what’s the difference? Keep reading
to tell the difference between these changes with explanations and examples of each.
difference between chemical and physical change
Chemical Change vs. Physical Change
Telling the difference between a chemical change and a physical change seems trickier than it is. The main
difference between a chemical change and a physical change is what happens to a substance’s
composition. Here are the basic definitions of chemical and physical changes:
chemical change – a process in which chemical bonds are broken or created to make a new substance
physical change – a process in which a substance changes its state of matter, but chemical bonds stay
intact
When matter undergoes a chemical change, it can’t return to its original state without additional reactions.
But when it undergoes a physical change, it only needs to return to its original state of matter. The
molecules of the substance haven’t been changed at all.
Examples of Chemical Changes
Chemical changes occur all around you in everyday life. Whenever a chemical reaction occurs, the chemical
properties of the original substance change to create an entirely new substance. Some examples of
chemical changes include:
1. Iron rusting
2. Burning firewood
3. Grilling meat
4. Organic matter decomposing
5. Fruit ripening
6. Food being digested
7. Frying an egg
8. Baking cookies
9. Photosynthesis
10. Tarnished silver
11. Food spoiling
12. Teeth decaying
13. Wine fermenting
14. Firing clay in a kiln
15. Respiration (breathing)
16. Fireworks exploding
Most of these changes cannot be undone after a chemical reaction. While you can use silver polish to
remove tarnish with another chemical reaction, for example, you can’t unfry an egg or reverse the
decomposition process of a dead leaf. Determining whether a change can be undone is a key factor in
deciding whether an item’s change is chemical or physical.
Examples of Physical Changes
Physical changes involve an object or substance changing shape or state of matter. Even though it now has
a different physical property, it’s still the same object or substance – its molecules are still the same. Here
are some examples of physical changes you might see:
1. Freezing water to make ice
2. Melting ice to make water
3. Heating water to make steam
4. Reshaping soft clay to make another shape
5. Crumpling a piece of paper
6. Bending a paper clip
7. Creating mud with dirt and water
8. Chopping vegetables
9. Breaking a pencil in half
10. Dissolving sugar into water
11. Eroding rocks on the coastline
12. Breaking a glass window
13. Tempering steel
14. Cutting fabric
While all of these processes are physical changes, some are easier to reverse than others. It’s much easier
to melt an ice cube than to put a carrot back together, for instance. But even though the pieces of a carrot
are smaller than a whole carrot, the molecules of each piece are unchanged – it’s still a carrot.
