The measurement of how fast molecules are moving

How do the molecules of hot air differ from the molecules of cold air? The molecules of hot air move faster than the molecules of cold air. The molecules of hot air move slower than the molecules of cold air. The molecules of hot air move at the same speed as the molecules of cold air. Skip to content Articles. February 26, Joe Ford. Table of Contents. Now as air expands, air molecules move away from each other.

Since air molecules are moving away from each other they do not collide as hard. If air molecules are not colliding as hard they will slow down. And since temperature is a measure of how fast molecules are moving, the temperature goes down too it cools.

In this case, molecules are slowing down simply because they are being banged into with less force, not because there is a transfer of heat energy, and so the process is adiabatic. Note: The reason there is no transfer of heat actually there is some, but it is negligibly small is because air is a terrible conductor of heat. Fast moving air is practically molecules rubbing against each other and moving in one direction at the same time.

If this answer doesn't help, you might want to check out the science answers and questions When water molecules are moving closer together in the air it is called. Conduction warms the atmosphere as fast-moving molecules come into contact with lower-energy molecules until all molecules are moving at about the same rate.

As the atmosphere warms, molecules move apart. As the heated air flows, heat is transferred by convection from warm, low-pressure air to cooler, high-pressure air.

Moving air probably has less molecules than still air because the particles are spread apart in moving air, and there is less of them, while in nonmoving air, it is packed. Velocity tells how fast something is moving, and in what direction.

Evaporation is slower in warm air then it is hot air because the molecules don't start moving as fast. This means evaporation doesn't happen quickly. First of all, you should know the definition of wind. Here it is: Wind is moving air. Wind is caused because the sun heats up some of the air molecules. Those air molecules move upwards, causing the rest of them to draft through the space left empty because of the upwards-moving molecules.

Temperature has a big effect on how fast air molecules travel. Air molecules move faster in hot weather and they move slower in cold weather. So temperature is the average kinetic energy of the molecules composing a substance right? Well the fast moving molecules hotter are less likely to condense.

It is harder for these fast moving molecules to 'stick together" upon bumping into each other compared to the slow sluggish colder molecules. So basically, the number of water vapor molecules needed to reach saturation in a given sample of air is greater in warm air than cold.

In hot air molecules are moving faster. Improve this question. Xtro Xtro 1, 2 2 gold badges 12 12 silver badges 12 12 bronze badges. Add a comment. Active Oldest Votes. Improve this answer. Scott Centoni Scott Centoni 3 3 bronze badges. By average speed, I meant the actual distance traveled in a specific period of time as we describe the speed of a car without thinking about axes.

Ignoring rotation is fine for me but can you explain the vibration of gas molecules? I thought they didn't vibrate by themselves without colliding others since they are not connected unlike liquid and solids molecules.

All molecules vibrate: the distance between the atoms in the molecule oscillates like a spring. Also see en. You can also purchase this book at Amazon. Effusion and Diffusion. Chemistrivia You may have noticed that the units for R are different here than when we mentioned it earlier.

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