Core TradesCâu 157 / 700
The R-value of an insulation material is a measure of its:
a.Fire-resistance rating
b.Resistance to heat flow (thermal resistance)
c.Density
d.Vapor permeability
Giải thích
R-value quantifies thermal resistance; a higher R-value means the material slows conductive heat flow more effectively. It is the inverse of the U-factor. R-value does not directly indicate fire rating, density, or how readily vapor passes through the material.
Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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