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Definition: Acetic acid is a chemical compound consisting of one oxygen atom and two hydrogen atoms in its structure, and it is a weak acid. It is a white or cream-colored liquid that has a sweet or sour odor. Acetate hydronium ion (H3C2O4-), which contains acetic acid as the negative charge, forms at low concentrations of acetate ions. The pH value of an aqueous solution of acetic acid is approximately 5. In water, it reacts with certain substances to form hydrogen peroxide and carbon dioxide gas. Acetic acid is widely used in various industries for its properties such as stability, anti-corrosion, disinfection and antiseptic. It is also a suitable solvent for many organic compounds, especially those that are hydrophilic.
Definition: Yeti is a term in Native American folklore that refers to a mysterious, prehistoric creature resembling an owl, often described as with feathers or antlers, which can fly long distances without wings and has been reported sightings by some indigenous people. The word "yeti" originates from the word "yet" (meaning again), suggesting the existence of this unknown entity after the Earth's orbit around the Sun changes every 670 years.