As an expert sommelier and brewer, I can confidently say that a 250ml glass of wine is indeed considered a large glass. When it comes to serving wine by the glass, there are specific quantities that establishments typically adhere to, and these quantities are based on industry standards and regulations.
In the case of still wine, it is common for it to be served in three different sizes: 125ml, 175ml, and 250ml. The 125ml glass is often referred to as a small glass, while the 175ml glass is known as a medium glass. The 250ml glass, which is equivalent to two small glasses, is generally considered a large glass.
The reason for these specified quantities is to ensure consistency in serving sizes and to give consumers options that suit their preferences. By offering different sizes, establishments can cater to customers who may want a smaller portion for various reasons, such as tasting multiple wines or simply consuming less alcohol.
Personally, I have encountered situations where customers have requested a larger glass of wine, particularly when they are looking to enjoy a full glass without having to order two separate servings. This is especially common in restaurants or bars where customers may want to savor a single wine without committing to a full bottle.
It's worth noting that these serving sizes are not set in stone and can vary depending on local regulations and cultural norms. In some regions, the standard serving size may differ or additional options may be available. However, in many parts of the world, the 125ml, 175ml, and 250ml sizes are widely accepted and used.
To summarize, a 250ml glass of wine is generally considered a large glass when it is served by the glass. This size provides an option for customers who prefer a more substantial serving of wine without needing to order multiple smaller glasses. However, it's important to remember that serving sizes can vary, so it's always best to check with the establishment or consult local regulations if you have any specific concerns or preferences.