Hello!
In a thermostat, the property of the bimetallic coil that allows it to contract and expand is that The two metals absorb different amounts of thermal energy.
This bimetallic coil is used to transform thermal energy into mechanical movement. Two metals with different thermal expansivity are joined together parallelly and the changes of temperature cause bending in different directions depending on if the temperature is rising or descending.
The differences in the thermal energy absorption of the two metals are the basis for the mechanism of this device.
Because the top layer of a pool will be warmer than the bottom layer, that why filtration is important to cycle the water evenly.
I think the answer maybe C
A point of a single dimension, a plane of two, and 3D involving the depth of the third dimension.
