vettä

Vettä is the Finnish word for water. In Finnish grammar, vettä is the partitive singular form of vesi, used in phrases such as "minä juon vettä" (I drink water). Water is a chemical compound with the formula H2O and is essential for all known life.

Water is a polar molecule that forms hydrogen bonds, giving it unique properties such as high surface tension, cohesion, and a high heat capacity. It expands when frozen and is less dense as ice than as liquid.

About 71% of Earth's surface is covered by oceans containing about 97% of the planet's water. The remaining 3% is freshwater, mostly locked in ice and groundwater, with small amounts in rivers, lakes, and soil moisture.

The water cycle circulates water through evaporation, condensation, precipitation, and collection, supported by transpiration from plants. Climate processes and human activity alter the cycle, affecting timing and availability of freshwater.

Human use includes drinking water, sanitation, agriculture, and industry. Water quality is monitored by pH, salinity, turbidity, and contaminants. Treatment may involve filtration, disinfection, and desalination; sustainable management addresses pollution, overuse, and climate-related variability.