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What is Difference Between Liquid, Vapor, and Gas?

In general, a vapour phase consists of a phase with two different substances at room temperature, whereas a gas phase consists of a single substance at a defined thermodynamic range, at room temperature.
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    In general, a vapor phase consists of a phase with two different substances at room temperature, whereas a gas phase consists of a single substance at a defined thermodynamic range, at room temperature. Thus, this is defined as the key differences between Vapor and Gas. You can find the major differences in the table below.

    VapourGas
    Vapour is a mixture of two or more different phases at room temperature, these phases are liquid and gaseous phase.Gas usually contains a single thermodynamic state at room temperature.
    Vapour has a definite shape of the gaseous particles when observed under a microscope.Gas does not a definite shape when it is observed under a microscope.
    Vapour consists of random molecules and atoms moving randomly about.Gas also consists of random molecules and atoms moving about randomly.
    Vapour is not a state of matter, unlike gases.Gases are a state of matter.
    Vapours of water are around us all the time at temperatures below the boiling point of water.Gases are usually formed above its critical temperature, but below critical pressure.

    For liquid, it have a definite volume, but take the shape of the container. The gases have no definite shape or volume.

    gas vs. vapor

    Although often used interchangeably, vapors and gases differ primarily in that a vapor is the gaseous state of a substance that normally exists as a liquid or solid under room temperature, while a gas is a substance that naturally exists in a gaseous state at room temperature.

    When comparing gas vs. vapor, one must consider the temperature and pressure conditions: a substance is a gas when it’s above its critical temperature and a vapor when it’s below.

    In the battle of vapor vs. gas, the key distinction lies in their origin: gases are substances that naturally exist in the gaseous state, while vapors are the gaseous form of substances that are generally in solid or liquid state at room temperature.

    The liquid phase is a state of matter characterized by its ability to flow and take the shape of its container, but with a definite volume that doesn’t expand like a gas.

    Whether in the liquid or solid state, the behavior and properties of a substance can vary dramatically, including changes in density, malleability, and thermal conductivity.

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    Picture of Will Don

    Will Don

    After earning my bachelor's degree in mechanical engineering from Zhejiang Normal University in 2008, l was fortunate enough to begin my career with Siemens, Fisher, and YTC, focusing on control valve accessories. Over the past dozen years, l've poured my heart and energy into understanding technology and fluid solutions for control valves.
    Now, as the marketing director for THINKTANK, a trusted branch of the Taiwan STONE valve group, I can't help butf eel proud of how far we've come. Our knowledge isn't just reaching professionals like engineer and valve distributors; it's also inspiring the next generation of automation college students.
    l genuinely hope you're enjoying our articles and finding them helpful.Your thoughts, questions, and feedback mean the world to me, so please don't hesitate to reach out to marketing[at]cncontrolvalve.com. Whether you're a seasoned expert or just curious about the field, I'm here to connect, share, and learn together.

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    I am the author of this article, and also the CEO and marketing director of THINKTANK, with 15 years of experience in the industrial valve industry. If you have any questions, you can contact me at any time.

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