In this blog post, we’ll explore how igloos are not just simple snow houses, but survival structures that embody Inuit wisdom and scientific principles, focusing on their insulation, heating, and structural features.
One of the first things that comes to mind when thinking of the Inuit (Eskimos) is the igloo. The igloo is a representative dwelling of the Inuit, an architectural structure embodying their wisdom for surviving in extreme cold. However, an igloo does not simply refer to a house made of snow. In fact, the term “igloo” is a general term for various types of dwellings; the Inuit built homes using a variety of materials, including not only snow but also wood and leather tents. However, as houses made of snow caught the attention of outsiders, the term “igloo” gradually came to refer exclusively to houses made of snow.
While an igloo may appear to be simply snow blocks cut into brick-like shapes and stacked into a hemispherical form, it hides remarkable scientific principles within. First, in the process of building an igloo, snow blocks are more than just building materials. Snow contains a lot of air, making it an excellent insulator that helps maintain the temperature inside the igloo. You might wonder how a house made of snow turns into an ice house. The secret lies in the igloo’s heating system.
After building the igloo, the Inuit light a fire inside to raise the internal temperature. During this process, the snow melts slightly, filling the gaps in the walls, and then the entrance is opened to allow the water to freeze again. Repeating this process transforms the snow-brick house into an increasingly solid ice house. At this point, the air trapped within the snow cannot escape and remains trapped in the ice, giving the igloo a unique, cloudy appearance rather than a transparent one. This is because light strikes the air bubbles within the ice and scatters.
The temperature inside an igloo is much warmer than outside. One reason for this is that an igloo receives more solar energy per unit area than the ground does. This works on the same principle as the equatorial regions receiving more sunlight than the polar regions. Additionally, some scientists explain that igloos maintain warmth through a principle similar to the greenhouse effect. Radiative energy from the sun to Earth consists of short-wavelength ultraviolet and visible light, but when Earth emits heat outward, it is released as long-wavelength infrared radiation. This long-wavelength radiation is absorbed by Earth’s atmosphere, helping to maintain a stable temperature—a phenomenon known as the greenhouse effect. Igloos also rely on their ice walls to block these radiation waves, thereby retaining the internal warmth.
The Inuit use a unique method to raise the indoor temperature when it gets cold inside the igloo: they sprinkle water on the floor. Unlike sprinkling water on a yard in summer, which cools the area, water sprinkled on the floor of an igloo freezes immediately, releasing heat. This causes the indoor temperature to rise. Using hot water is more effective than cold water because hot water evaporates faster due to its higher temperature, resulting in quicker freezing. Through this process, the temperature inside the igloo becomes even warmer.
Did the Inuit understand scientific principles such as melting, freezing, radiation, and evaporation while building igloos? They likely did not know these principles theoretically. However, based on experience and wisdom accumulated over many years, the Inuit mastered the art of constructing structures out of snow without using adhesives and heating them using water. An igloo holds a significance that goes beyond that of a simple house.
It is the Inuit way of life, developed to survive in extreme environments, and the culmination of their survival skills.
Today, the igloo has evolved beyond a mere traditional dwelling to become an important cultural icon symbolizing life in the polar regions. The wisdom of the Inuit continues to inspire modern society, and the igloos they created remain marvelous structures where science and tradition converge.
