Bluetooth operates at frequencies between 2402 and 2480 MHz, or 2400 and 2483.5 MHz including guard bands 2 MHz wide at the bottom end and 3.5 MHz wide at the top. This is in the globally unlicensed (but not unregulated) Industrial, Scientific and Medical (ISM) 2.4 GHz short-range radio frequency band.
The conversion between the two is 1000 kg/m3 to 1 g/cm3. Water never has an absolute density because its density varies with temperature. Water has its maximum density of 1g/cm3 at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less then 1 g/cm3. Water has the maximum density of 1 g/cm3 only when it is pure water.
In addition to all the molecular motions, in liquid water there is a continuous exchange of hydrogens between water molecules-about one exchange per millisecond at a neutral pH of 7.0 and more rapidly when the pH departs from neutrality. Water provides the standard for density at 1 gram/cm 3. While water may seem to be an ordinary liquid, its properties are in many ways unusual. The changes in the properties of water near its freezing point are illustrated below with sketches adapted from Debenedetti and Stanley.