Igloo effect
The Igloo effect refers to the phenomenon that allows igloos and similar structures to remain warm on the inside, despite being made of snow and located in frigid environments. The effect is primarily due to two factors–thermal insulation and body heat.
Description
[edit]
An igloo is a type of shelter constructed with snow blocks and are often located in frigid environments. The igloo effect refers to the phenomenon where snow structures, such as the igloos, maintain a higher or warmer interior temperature compared to the outside environment despite being made of ice or snow.[1] The snow contains a large number of trapped air pockets between ice crystals, which has a low thermal conductivity, and hence serves as an effective thermal insulation, thereby significantly reducing heat transfer between the interior and exterior of the structure.[1][2][3] As a result of this insulation, any heat generated inside the igloo, such as body heat from the occupants and other heat sources, is retained within the structure.[1]
Whilst snow itself has a temperature lower than 0 °C (32 °F) i.e. the freezing point of water, a well-constructed igloo can maintain an average temperature of 16 °C (61 °F) even if heated internally only by body heat of an occupant.[3][4] However, in an igloo, the thermal characteristics and the insulation effect depends on the snow conditions, and the other parameters such as the size, structure, and arrangement of the shelter. During the construction of the igloo, if the blocks are thicker, they can cause excessive heating and risk melting. When warm air diffuses into the interior, it rises to the roof and forms a thermal gradient that keeps cold air from reaching it. Hence, an igloo with a higher dome has a higher temperature than a low dome igloo, though smaller igloos require less heating than larger ones to achieve the same temperature level.[5]
Examples
[edit]In 2012, a Swedish man, who was trapped in his car for two months, had been insulated from the −30 °C (−22 °F) outisde weather by snow which had created an igloo around his vehicle, and later made a full recovery.[6][7]
References
[edit]- 1 2 3 "All About Snow – Science of Snow". National Snow and Ice Data Center. Retrieved 17 June 2025.
- ↑ "Insulation". United States Department of Energy. Retrieved 17 June 2025.
- 1 2 "Why Didn't This Man Freeze To Death?". HuffPost. 23 February 2012. Retrieved 21 August 2023.
- ↑ "Here is How an Igloo Can Keep You Warm". Vedantu. Retrieved 21 August 2023.
- ↑ Zhen, Meng; Dong, Qi; Xu, Min; Liu, Ying; Zhang, Hongrui; Jia, Yongheng; Yang, Bin (1 March 2021). "Thermal benefit of igloos in extremely cold conditions in Harbin, China". Building and Environment. 190 107546. doi:10.1016/j.buildenv.2020.107546. ISSN 0360-1323. S2CID 233794599.
- ↑ "Man Survives Two Months In Snow-Covered Car". HuffPost. 19 February 2012. Archived from the original on 21 August 2023. Retrieved 21 August 2023.
- ↑ Davies, Lizzy (19 February 2012). "Swedish man survived in snowed-in car for two months". The Guardian. ISSN 0261-3077. Retrieved 21 August 2023.