Pure vegetable or olive oil does not contain gluten.
More than hundred cooking oils are known and used today; each has a different composition. Also cooking oils are mixtures and doesn't have a chemical formula as a compound.
Cooking oils are mixtures of fatty acids; a general scientific name or a single formula doesn't exist. Now are used more than 100 cooking oils, each with his specific composition.
Yes, cooking oil is made out of oil.
cooking oil
Jews use oil in cooking for the same reasons that anyone uses oil in cooking.
Nope.
oil and water
The main advantage is to re-use (re-cycle) the cooking oil again, which saves having to buy new cooking oil. Though, eventually, new cooking oil will be needed to replace or top-up old cooking oil lost to evaporation, or cooking oil tainted with a strong smell, possibly from cooking a lot of smelly fish.
Mineral oil should NEVER be used for cooking. It is a petroleum byproduct, not a food-based cooking oil.
Yes, homogeneous mixtures and heterogeneous mixtures are important in daily life. Homogeneous mixtures like saltwater or air are common in our environment, while examples of heterogeneous mixtures include salads and trail mix. Understanding these mixtures helps in cooking, cleaning, and various other activities.
Flour, sugar, and salt are three common dry mixtures used in baking and cooking.
Bleach, Oil, Blood