Each 400 mL bottle of butterbeer contains an unknown quantity of a special gas called "Giggity gas" that is collected over the drink and has been shown to make the drinker inexplicably happy. If the pressure in a bottle of butterbeer is 867 torr and the partial pressure of butterbeer is 69 torr, how much Giggity gas is in each bottle?

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.