Question

it is recommended to use air tight container for storing oil for long time give reason

Answer 1

hey!!!!!

Assuming you mean cooking oil, you store oil in an airtight container for three reasons: First, oil oxidizes— it loses its flavor, can become rancid, may even lose its cooking characteristics— viscosity, smoke point, &c. Second, oil can become contaminated with foreign objects/substances— dust, bugs, water, &c. Third, oil is really messy when it’s spilled, and a tight container helps avoid that.
Much of the same could be said for non-cooking oils. Granted, the flavor wouldn’t be an issue, but oxidation could affect the other properties that the oil needs to perform. Reasons two and three would also apply.

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Answer 2

Oxygen (and sunlight) can affect the quality of oil. The oil turns rancid after some time. And storing the oil in a really airtight container (like a can from which air has been evacuated before sealing) should prevent or at least slow the process.

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