> In The Netherlands [...] a small beer of whatever's on tap [...] is 250ml-350ml
Traveler beware: Just because it's true that a Dutch "vaasje" glass is 230-330ml[1] the actual volume of beer you get is at best 80% of that. The Dutch pouring practice of handing patrons a glass of beer with up to 1/4 receding foam on the top would cause a riot across the channel.
> [...]and measure 1000 grams. Which is EXACTLY the same amount as 1000 milliliters[...]
No, not exactly. Not even under standard conditions. It's one of the unfortunate warts of the modern metric system that the actual value drifted from exactly 1000, almost, but not exactly[2].
Traveler beware: Just because it's true that a Dutch "vaasje" glass is 230-330ml[1] the actual volume of beer you get is at best 80% of that. The Dutch pouring practice of handing patrons a glass of beer with up to 1/4 receding foam on the top would cause a riot across the channel.
> [...]and measure 1000 grams. Which is EXACTLY the same amount as 1000 milliliters[...]
No, not exactly. Not even under standard conditions. It's one of the unfortunate warts of the modern metric system that the actual value drifted from exactly 1000, almost, but not exactly[2].
1. https://nl.wikipedia.org/wiki/Vaasje
2. https://en.wikipedia.org/wiki/Density#Water