a thermometer
The easiest way is with a floating thermometer.
You use a water heater, which may be electric or gas, to circulate the pool water through and maintain temperature.
The body temperature of a fish swimming around in water that is 60 degrees would be 60 degrees also. This is because fish, unlike mammals, are coldblooded; they do not waste energy keeping their body temperature constant. Their body temperature would match that of the water around them.
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Swimming pool water can be what ever temperature you would like it to be just not too cold or too hot just need to have a little relaxation. :)
The anwser to this QuestionWe would use a termometre to measure , the temperature of a swimming pool .A thermometer.
Wind, humidity, and temperature
The echidna is not a water-dweller, but it does go into th water. Though its body shape and spines would seem to inhibit its swimming ability, the echidna actually swims quite well, and even uses swimming as a means to regulate its own temperature.
Thermometer
To raise the temperature of water in a thimble of water from 0 to 100 requires a small amount of thermal energy. To do the same with a swimming pool would require putting a huge amount of thermal energy into the water comparatively speaking.
If someone wants to test the water in a swimming pool then they need to buy a supply of the water testing kits that are available. These use chemicals and colors to indicate what is needed to be added to purify the water. Chlorine in some form is also needed regularly.
Because they are the same temperature. There are more calories of heat in a 100-ml sample of water that's at a certain temperature than there are in a 10-ml sample that's the same temperature...but 20-degree-Celsius water is 20-degree-Celsius water whether you have a thimbleful, a glassful or a swimming pool full.