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Cooking oil cannot be compressed in the traditional sense like gases or solids. However, it can undergo processes that alter its physical properties. For example:

Hydrogenation: This process involves adding hydrogen to liquid vegetable oils to make them more solid or semi-solid at room temperature, creating what's known as partially hydrogenated oils. This process changes the structure of the oil, making it more stable and suitable for certain cooking applications.

Fractionation: Fractionation separates different components of oil based on their melting points. This process is often used to produce oils with specific properties, such as those used in margarine or frying.

Blending: Oils can be blended to achieve desired characteristics, such as a higher smoke point for frying or a specific flavor profile.

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