Learning Objectives

Define, solid, liquid, and gas.Explain differences among these 3 phases that matter.

You are watching: Does a gas have a definite volume

Why is the state that water various in every picture?

Why is the state the water different in every picture?

Water deserve to take countless forms. At low temperatures (below 0°C), it is a solid. Once at “normal” temperatures (between 0°C and 100°C), the is a liquid. While in ~ temperatures over 100°C, water is a gas (steam).

The state the water is in counts upon the temperature. Each state (solid, liquid, and also gas) has its own unique set of physical properties.

Matter and also Its States

Matter typically exists in one of three states: solid , liquid , or gas . The state a given substance exhibits is also a physics property. Part substances exist as gases at room temperature (oxygen and also carbon dioxide), if others, choose water and mercury metal, exist as liquids. Most steels exist as solids at room temperature. All substances have the right to exist in any kind of of these 3 states. In addition to currently in one of the 3 states, matter can additionally undergo a change of state. A readjust of state wake up when issue is converted from one state to one more state for example when a fluid is converted to a gas or a solid is convert to a liquid.

Note: Technically speaking a 4th state the matter dubbed plasma exists, however it does not naturally happen on earth, so we will certainly omit that from our examine here.


Liquids have actually the following characteristics:

no definite shape (takes the shape of its container)has identify volumeparticles are totally free to move over each other, yet are still attracted to every other

A familiar liquid is mercury metal. Mercury is an anomaly. The is the only steel we know of that is liquid at room temperature. Mercury additionally has an ability to stick to chin (surface tension) – a property all liquids exhibit. Mercury has a fairly high surface ar tension, which renders it an extremely unique. Right here you watch mercury in its typical liquid form.

Figure 2.6


If us were to heat liquid mercury come its boiling point of 357°C, and also under the right press conditions, we would notification all particles in the liquid state enter the gas state.


Gases have actually the adhering to characteristics:

no definite shape (takes the form of its container)no definite volumeparticles move in random activity with tiny or no attraction to each otherhighly compressibleSolid

Solids are defined by the adhering to characteristics:

definite shape (rigid)definite volumeparticles vibrate about fixed axes

If we were to cool liquid mercury come its freezing allude of -39°C, and also under the right press conditions, us would an alert all of the liquid particles would get in the heavy state.

The video clip below mirrors this process.

As you deserve to see in the video, mercury have the right to be solidified when its temperature is carried to its freezing point. However, when returned come room temperature conditions, mercury does not exist in solid state for long, and returns back to its an ext common fluid form.

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Three claims of matter exist – solid, liquid, and gas.Solids have a definite shape and also volume.Liquids have actually a identify volume, but take the shape of the container.Gases have actually no definite form or volume.



Use the internet site to answer the complying with questions:


Which material is a gas at room temperature (25°C)?Which material is a solid at room temperature?Which product is a fluid at room temperature?What wake up to the activity of the particles together you increase the temperature?What wake up to the movement of the particles as you decrease the temperature?



How countless states of issue are there?What is a solid?What is a liquid?What is a gas?