This time, I will write about the fact that the density of fine bubbles changes depending on the season. Some photos are attached to show the differences. These photos were taken in December, April and May. Since I used the flash in my bathroom, they look a little darker in April and May than I actually saw. December one is originally dark, so the effect of the flash does not seem to matter much. Wish I had a picture of midsummer, but unfortunately I do not.
The method of generating fine bubbles was to heat bath water with a water heater and generate them directly with only using the fine bubble generating nozzle.
In the photo taken on December 9th, the bottom of the bathtub is barely visible. At this time, the tap was tighten to some extent, so I think the water pressure was about 0.15-0.2MPa.
When the photo was taken on April 27, the bath water temperature was 41 ℃, the tap water temperature was 17 ℃, and the tap was fully open. The water pressure at this time was around 0.3MPa. Compared to December, the density of fine bubble is very different.
This difference is due to the amount of gas dissolved in tap water. As the atmospheric temperature rises, the water temperature of the water purification plant rises too, and the amount of gas dissolved in tap water decreases. Probably some of you may remember studying about this in the school science.
When the photo was taken on May 21, the bath water temperature was 41 ° C, the tap water temperature was 21 ° C, and the tap was fully open. The tap water temperature was about 4 ℃ higher than in April, so the fine bubble density was slightly thinner than in April.
If you enter the bathtub in this state, the water will be denser than this state. If you take a bath every day, although there would be individual differences, we recommend you a low-density fine bubble bath.