If you take an empty plastic bottle to the top of a mountain, let it fill with air, and seal it shut, what will happen to the bottle as you descend the mountain?
Ja, atrazdamies augstu kalnos, tu piepildītu tukšu plastmasas pudeli ar gaisu, to cieši aiztaisītu un tad kāptu lejā, pa ceļam pudele deformētos.