From looking at original German recipes and their translations, "3 Tr" would mean "3 Tropfen" or "3 drops". Drops can vary in size.
It would be pretty difficult to eye the difference between 1/32 and 1/25 of a teaspoon. I'm not so certain your taste buds would pick up the difference in a cookie or cake recipe. I'd probably get a dropper bottle to use for that recipe, but realize that even drops vary in volume.
Approximately 5 grams
You can't buy a teaspoon of vanilla at any store.
enough??? daaa!
I'm assuming you mean vanilla extract. Pure Vanilla extract is more expensive but it is of much higher quality You can't buy just one teaspoon.. you can buy small bottles but they're at least 6 teaspoons (one fluid ounce) that'll run you about $4-5
Almond extract is just a flavoring, you can substitute any other flavor for it. This of course changes what you are making. Vanilla would be a common substitute or Rum depending on what the recipe is.
Depends where you buy it.
1/4 teaspoon
Depends where you buy it.
I'd say 1/2 teaspoon to 1 teaspoon per batch.
about 10,000 pounds per gram
20,0000 per minute
You can't buy it by the teaspoon. A small bottle is about $2