Essential oil extraction?

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Angelo Mathes

The following is nice published article that might help you answer your question that is trustworthy because its summary is a available in the United States of America National Library of Medicine database: MIjat Bozovic et. al. Esential oils extraction: a 24-hour steam distillation systematic methodology. Nat Prod Res 2017 Oct; 31(20): pages 2387-2396

Niti Sharma

They have low flash points and hence can easily vaporize when heated above that temperature. The aroma and quality of essential oils change with the temperature and duration of storage.