Amaterial with a lower/higher r-value is a better insulator.

A material with a higher R-value is a better insulator.

The R-value is a measure of a material’s (such as a layer of insulation) resistance to conductive heat flow. Materials with higher R-value indicate better insulating properties or effectiveness. Certain factors such as the thickness, density and the type of insulation determine the R-value of most materials while for some insulation, it is also determined by aging, temperature and moisture accumulation.

amber has allowed scientists to study dna that has been preserved over millions of years.

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