Using the average value of the thermal conductivity as k = 32 Btu/(hr ft °F) or 0.55 W/(m K), the thermal diffusivity is calculated to be 0.013 ft2/h or 3.3x10−7 m2/s.
jˈuːzɪŋ ðɪ ˈævɹɪdʒ vˈæljuː ʌvðə θˈɜːməl kɑːndəktˈɪvᵻɾi æz kˈeɪ ˈiːkwəlz θˈɜːɾi tˈuː bˌiːtˌiːjˈuː slˈæʃ ˌeɪtʃˈɑːɹ ˌɛftˈiː dᵻɡɹˈiːz ˈɛf ɔːɹ zˈiəɹoʊ.fˈɪfti fˈaɪv dˈʌbəljˌuː slˈæʃ ˈɛm kˈeɪ, ðə θˈɜːməl dᵻfjuːsˈɪvᵻɾi ɪz kˈælkjʊlˌeɪɾᵻd təbi zˈiəɹoʊ.zˈiəɹoʊ θˈɜːtiːn ˌɛftˈiː tˈuː slˈæʃ ˈeɪtʃ ɔːɹ θɹˈiː.θɹˈiː ˈɛks tˈɛn mˈaɪnəs sˈɛvən ˈɛm tˈuː slˈæʃ ˈɛs.