The density of a fluid goes down (becomes less dense) when heat is applied.
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Density (:
This question requires density to answer. Density is a ratio of mass to volume, and is dependent on temperature. Materials do have variable density based on temperature. The equation for density is mass/volume.
An increase in temperature causes thermal expansion which increases the volume. This cause a decrease in density. Except in the case of water between 0 and 4 degrees C, where increased temperature results in a contraction and so increased density.
It depends entirely on what the initial temperature and volume of the water is and how much heat is applied.
Heat and mass transfer in greenhouse, Heat Flux in a Grain Bin, Suspension systems in tractors, Fluid Flow in a Pipe, Concentration in a Chemical Reactor, Falling Water Table, etc. Answered by Ramin Shamshiri, U. of Florida at Gainesville.