Vesikivellätermillä
Vesikivellätermillä is a Finnish term that translates literally to "water stone thermometer." It refers to a simple, often improvised, method for estimating water temperature using a stone. The technique involves submerging a stone in the water for a period of time and then touching the stone to gauge its temperature. By comparing the stone's warmth or coolness to one's own perceived body temperature or to a known ambient temperature, a rough estimation of the water's temperature can be made.
This method is not precise and is highly subjective, relying on the individual's sensory perception. It is