{"id":2639,"date":"2021-01-13T18:29:53","date_gmt":"2021-01-14T02:29:53","guid":{"rendered":"https:\/\/housefragrance.com\/?p=2639"},"modified":"2021-03-24T20:14:21","modified_gmt":"2021-03-25T03:14:21","slug":"do-essential-oils-evaporate","status":"publish","type":"post","link":"https:\/\/housefragrance.com\/do-essential-oils-evaporate\/","title":{"rendered":"Do Essential Oils Evaporate?"},"content":{"rendered":"\n

Essential oils are concentrated plant extracts. They are used in perfumes, cosmetics, and aromatherapy. They are used to promote health and well-being and can even be used as a natural alternative to pharmaceuticals for some medical conditions.  <\/p>\n\n\n\n

Essential oils can be extracted from the plants through steam distillation, in which steam passed through the plant draws out the oils. The oils are then collected once the steam condenses. Cold pressing can also be used to extract essential oils through the mechanical action of squeezing.<\/p>\n\n\n\n

Essential oils are extremely volatile, and therefore they evaporate easily. Molecular size, temperature, surface area, and air circulation affect the rate of evaporation. There are steps to take to minimize unwanted evaporation. Evaporation affects the diffusion of essential oils.<\/strong><\/p>\n\n\n\n

The medicinal properties of essential oils depend largely on the specific oil, but all essential oils have similar physical properties. Essential oils are strongly aromatic, colorless liquids at room temperature; they are lipid-soluble but not water-soluble, and they are extremely volatile.<\/p>\n\n\n\n

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What Causes Essential Oils To Evaporate?<\/strong><\/h2>\n\n\n\n

Essential oils are very volatile. Volatility measures the ease with which a substance vaporizes; therefore, essential oils can easily evaporate. Evaporation is the process whereby substances change from their liquid phase to their gaseous phase. Why does this happen?<\/p>\n\n\n\n

In a liquid such as an essential oil, the molecules are always moving, although they move at different speeds. Some move slowly, and others move quickly. These molecules are always bumping into each other, the sides of the liquid container, and the surface of the liquid. The surface of a liquid exerts a pressure known as surface tension. If a molecule is moving fast enough when it hits the liquid’s surface, it will have enough energy to overcome the surface tension, escape the liquid, and become a gas<\/strong>.<\/p>\n\n\n\n

How Quickly Do Essential Oils Evaporate?<\/strong><\/h2>\n\n\n\n

The rate at which essential oils evaporate depends on a number of factors.<\/p>\n\n\n\n

Molecular size affects the rate of essential oil evaporation.<\/strong> Molecules of essential oil escape as a vapor when they have enough energy to overcome the oil’s surface tension. This energy is related to the speed at which the molecules are moving. Larger molecules are heavier and require more energy to reach the necessary speeds for evaporation to take place.<\/p>\n\n\n\n

Temperature affects the rate of essential oil evaporation.<\/strong> Increasing the temperature of the essential oil increases evaporation. This is because it increases the kinetic energy of the essential oil molecules, and they move faster. The faster the molecules move, the easier it is for them to overcome the surface tension and escape into the atmosphere in the gas phase.<\/p>\n\n\n\n

Surface area affects the rate of essential oil evaporation.<\/strong> Evaporation occurs at the surface of the essential oil liquid. A greater surface area increases the likelihood of the moving essential oil molecules hitting the surface and escaping.<\/p>\n\n\n\n

Air circulation affects the rate of essential oil evaporation. <\/strong>Essential oil vapors can saturate the air directly around the container, which will reduce the opportunity for new evaporation. If there is constant air circulation, it increases the rate of essential oil evaporation by sweeping the saturated air away from the container and replacing it with “fresh” air into which the oils can evaporate.  <\/p>\n\n\n\n

What Does Evaporation Mean For Diffusion Of Essential Oils?<\/strong><\/h2>\n\n\n\n

Essential oils are added to machines called diffusers, which disperse the essential oils into the air. The faster the essential oils evaporate, the faster their aroma fades. This means that the aroma from lighter oils will last a short time, while the aroma from heavier oils will linger.<\/p>\n\n\n\n

Light-weight essential oils include Balsam Fir, Cedarwood, Eucalyptus, Grapefruit, Peppermint, and Lemon. These produce what are called top notes, and they do not last long.<\/p>\n\n\n\n

Medium-weight essential oils include Cyprus, Germanium, Ginger, and Rose. These produce what are called middle notes, which provide a steady aroma.<\/p>\n\n\n\n

Heavy-weight essential oils include Cumin, Myrrh, and Sandalwood. These produce what are called bottom notes, and their aromas last for a long time.<\/p>\n\n\n\n

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