Why does gas expand?

Brett Kuhic asked a question: Why does gas expand?
Asked By: Brett Kuhic
Date created: Fri, Mar 12, 2021 9:21 PM
Date updated: Thu, Jun 23, 2022 12:50 PM


Video answer: Why does expanding gas cool?

Why does expanding gas cool?

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Molecules within gases are further apart and weakly attracted to each other. Heat causes the molecules to move faster, (heat energy is converted to kinetic energy ) which means that the volume of a gas increases more than the volume of a solid or liquid.

Video answer: Why does heating a gas cause it to expand?

Why does heating a gas cause it to expand?

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TL;DR - Gases expand to fill space because the particles of a gas have so much energy that they fly off in all directions, overwhelming the forces that hold them together. 99 75 9 4

Because of intermolecular attractive forces (see Van der Waals force), expansion causes an increase in the potential energy of the gas. If no external work is extracted in the process and no heat is transferred, the total energy of the gas remains the same because of the conservation of energy.

When a gas expands, the gas does work to overcome the intermolecular forces of attraction (it implies that the gas is spending it's own energy).This results in the decrease in internal energy of the system. Since internal energy is a function of temperature, expansion of gas decreases the temperature of the gas.

Most solids, liquids and gases expand when they are heated because the molecules that make up the substance move more rapidly, which puts more distance between each of the molecules. This property of matter hold true irrespective of the state of matter in most cases.

Imagine the gas was in a cylinder and expanded by pushing against a piston. The movement would involve work being done. This work would need energy, which would come from the kinetic energy of the gas molecules hitting the piston- reducing their average speed. Taking KE away corresponds to lowering the temperature of the gas.

Size-Changing Science: How Gases Contract and Expand - Scientific American. Latest Issues. Menu. Scientific American.

Why does increasing the pressure of a gas increase the reaction rate? A. it increases the temperature of the gas. B. it increases the reaction-rate constant. C. it increases the activation energy.

The April-to-September vacation-driving season often causes an increase in gas prices. Prices fall in the winter, because transportation needs and production costs are lower. This price decrease even offsets an increase in home heating oil usage for winter in northern areas of the U.S.

As a gas (like air) expands, the value of V increases and this has the effect of increasing T (The temperature). As the energy needed to increase it's temperature must be supplied from somewhere, the gas takes the energy from the surrounding system giving the effect of cooling. This is a principle used in refrigeration.

The volume of the gas has increased and its density has decreased. Let’s make the jar bigger again. Again, those air molecules are still bouncing around at high speed. There is more space ...

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Video answer: Gas exchange

Gas exchange