What is the proof of 9 percent by volume in 1.5 liter wine?

You're asking about the alcohol content of a 1.5 liter bottle of wine that is labeled as 9% by volume.

Here's what "9% by volume" means:

* 9% alcohol by volume (ABV) indicates that 9% of the total volume of the wine is pure alcohol.

To calculate the amount of pure alcohol in the bottle:

1. Convert the volume to milliliters: 1.5 liters * 1000 ml/liter = 1500 ml

2. Multiply the total volume by the ABV: 1500 ml * 0.09 = 135 ml

Therefore, a 1.5 liter bottle of 9% ABV wine contains approximately 135 ml of pure alcohol.

Important Note: This is a theoretical calculation. The actual alcohol content might vary slightly due to production factors.