A HYGROMETER MEASURES THE AMOUNT OF HUMIDITY IN THE AIR. THE ATMOSPHERE ALWAYS CARRIES A CERTAIN AMOUNT OF WATER VAPOUR, THE PROPORTION OF WHICH VARIES WITH TEMPERATURE. THE WARMER THE AIR THE MORE MOISTURE IT WILL CONTAIN. AS AIR BECOMES COLDER THE WATER VAPOUR IN IT CONDENSES INTO MOISTURE TO PRODUCE DEW OR FROST. IN A MIST OR FOG THE AIR IS COMPLETELY SATURATED AND THIS IS CALLED 100% HUMIDITY.
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Van Leest Antiques
Van Leest Antiques, based in Utrecht in the Netherlands, specialises in antique scientific and medical instruments. Their collection covers mainly scientific and medical antique instruments: barometers, globes and planataria, nautical instruments, anatomical models, and pharmacy items. Toon Van Leest travels regularly in Europe and visits trade fairs, auctions, and antique dealers to collect stock and to find pieces to fulfil his clients' unusual requests.
As well as being an avid antique collector and dealer, Toon Van Leest is also a dentist. He believes that antiques are a stable investment, not reliant on trends or fashion, and have truly lasting value. Above all, he says, antiques are timeless and never lose their beauty.