A corkscrew, a glass and a patch of sun for a picnic are all you need to enjoy a bottle of wine. But what a shame if the wine is lukewarm rather than cool!

This piece of advice, offered in the introduction to the Larousse Encyclopedia of Wine , points out the importance of drinking wine at the right temperature – which is why you need ravi, a Canadian invention that is practical and ingenious.

Unfortunately, red wines are usually served too warm. The alcohol tends to predominate, concealing the fruit of the wine. As a result, the wine loses its typicity and personality. Ravi, which is intended mainly for red wine, enables you to go instantaneously from room temperature to that of a wine cellar, namely between 12 and 18 degrees Celsius (54 and 64 degrees Fahrenheit). When you’re enjoying white wine or rosé wine, ravi can cool to perfection a wine that has been left at room temperature for a little too long.

This table shows the suggested temperature at which you should drink various wines.