Mixing Hot and Cold Water

Assumption: When you put the two together, when there is hot water at the bottom, the hot water rises to the top and mixes with cold water on the way. This is due to the density of the two temperatures. Variable: The variable in this experiment is the temperature of water. Purpose: Mix hot water and water. Equipment: * Two identical small glasses. * Hot water * Cold water * Food color * Index card * Scissors * Shallow baking tray (Otherwise, please do this experiment with a sink) Method: 1 Fill one of the glass with very hot water.

The thermostat mixing valve uses wax particles to control mixing of hot and cold water. A common use is to allow the electric water heater to operate at a sufficiently high temperature (above 60 ° C (140 ° F)) to kill Legionella while the valve output does not suffer burns immediately Water (120 ° F)). Wax particle driven valves can be analyzed by plotting the hysteresis of wax particles consisting of two thermal expansion curves: elongation (movement) and temperature rise, contraction (movement) and temperature drop. The difference between the upper curve and the lower curve is a visual indication of the hysteresis of the valve, and due to the phase change between solid and liquid, there is always hysteresis in the wax driven valve. Hysteresis can be controlled with a special mixture of hydrocarbons; strict hysteresis is most needed, but some applications require a wider range

Acidity and alkalinity are the two extremes that represent chemical substances and are the same as the heat and cold are the two extremes that represent temperature. Mixing acid and base can offset extreme effects just like mixing water and water to equalize water temperature. Substances that are neither acid nor alkaline are neutral. pH is a measure of the acidity or basicity of a substance. The pH range from 0 to 14.7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic. Each of the lower pH values ​​less than 7 is 10 times higher than the next higher value. For example, the acidity at pH 4 is 10 times the pH 5 and the acidity is 100 times the pH value (10 × 10 4). The argument is alkaline rather than the next lower overall value. For example, the pH 10 is 10 times the pH 9 and the alkalinity is 100 times the pH (10 × 10).

Imagine three glasses of water: one hot water, the other cold, and one room temperature. If you put your hands in a bowl of room temperature water, you will experience room temperature as water. But what if you first put your hands in a cold or hot ball? In fact, you can deceive yourself to experience the same room temperature water regardless of hot water, cold water, hot water just by changing the way you encounter. But what if the water temperature does not change? As usual, an intuitive self selflessly takes a shortcut instead of trying to judge the warmth and cold of water in an absolute sense, but reports whether it is warm or cold compared to recent experience . In other words, when we first put the hands in a hottie we move the comparison point to a higher temperature, but the warm water feels (relatively) cold.