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Please note that there are individual differences, between different liquids, or between different solids. But as a rough guideline, you can expect light to be fastest in the materials that are less dense - and also as a rough guideline, solids are often more dense than liquids, and liquids are almost always more dense than gases. However, there is a lot of overlap between solids and liquids - check the Wikipedia article "List of refractive indices" for some examples.

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7y ago
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6y ago

Light is fastest through gas. But between solids and liquids, it depends on the substance.For example, approx speeds are:

Methanol (liquid) 225,000 km/s

Glass (solid) 200,000 km/s

Methylene iodine (liquid) 173,000 km/s

Diamond (solid) 124,000 km/s.

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Q: What is the order from slowest to fastest of increasing speed of light waves passing through solidsliquidsand gas?
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