we know that density of water is maximum at 3.98°C but when it is cooled below 0°C, will its density decrease by decreasing temperature and will there be a temperature at which its will be higher than that at 3.98°C........???
the density of water is maximum at 3.98°C... so that clearly states that there can be no other temperature at which the density will be more than that!! and yeah it's density will decrease if you decrease (or increase) temperature. but then again, water will freeze at 0°C, unless you regulate the pressure accordingly.