A metre is a comfortable measurement. The length of a pike is about one metre, that of Finland is a million, and a cubic metre is one thousand litres. A thousand litres of water weighs a tonne. Easy! It must have been a walk in the park to develop and adopt such a simple and functional system. Or was it?
Some physics instruments can be quite captivating due to, for instance, their peculiar shape or material. Take this pear-shaped object known as Nicholson’s hydrometer, for example. With the anniversary of the Great Fire of Turku of 1827 taking place on 4 September, we decided to select as the object of the month one of the treasures that survived the blaze and now features in our collection. What is this pear-shaped, streamlined, metallic object known variously as an areometer, a gravimeter, a densimeter and a hydrometer? The names tell us very little about the object itself, so let’s find out more.