A liquid's resistance to flow. A variety of models are available depending on the viscosity range to be measured and display type.
Sound travels faster in warm water than in cold water.
The travel time of a sound signal from a source near California to a receiver near Alaska, for example, will decrease if the intervening ocean warms up, and will increase if the ocean cools down. The travel time is a direct measure of the average temperature between the source and receiver. The information obtained is similar to that which is obtained for the atmosphere by averaging temperature data from the many thousands of land-based weather stations that exist. By measuring the travel times ofThe concept of temperature is as fundamental a physical concept as the three fundamental quantities of mechanics - mass, length, and time. Through the study of such practical problems as how to make a highly efficient steam engine, fundamental physical theories emerge, including the concepts of the quantum theory and the two laws of thermodynamics.