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metal prints jar metal prints diffusion metal prints diffusing metal prints tube metal prints tubes metal prints element metal prints halogen metal prints gas metal prints gaseous metal prints bromine metal prints evaporation metal prints evaporating metal prints vapour metal prints vaporizing metal prints pressure metal prints

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Bromine diffusion. Image 2 of 2. Bromine vapour (orange) diffused upwards to fill two gas jars. Bromine liquid is weakly bonded, and so it will readily evaporate at room temperature. Because gas molecules can move independently of each other and do so randomly, a gas spreads out from its source in a process called diffusion. The diffusion rate depends mainly on the temperature (affecting the speed of the gas molecules) and the medium through which the diffusion takes place. In this case, the medium is air. The gas colour allows the diffusion to be observed. For the vapour partially diffused up the glass jars, see image A150/309.

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