👉 The term "sandglass" refers to a device used for cooling water by blowing hot air through a heated sand. This is often used in buildings, boats, and other structures where heat transfer from the sun is not efficient enough. In simpler terms, it's like having a fan that blows cool air into your house or car when you need to cool down quickly. The sandglass acts as a filter that traps hot air and turns it back into water, which helps cool your home or vehicle faster
