It would take 32 tablespoons
You fill the glass up.
When you put water in a glass you fill it up.
To fill a glass with water in Old School RuneScape, you can simply right-click on a water source like a sink, fountain, or water pump with a glass in your inventory and select "Use" to fill it. In RuneScape 3, you can do the same by right-clicking on a water source with a glass in your inventory and choosing the "Fill" option.
The only way to answer this is to know what substance you are measuring. Tablespoon is a measurement of volume (15 ml) and gram is a measurement of weight. 120 grams of water would fill a volume of 120 ml or 8 tablespoons whereas 120 grams of salt (which is about 2.1 times denser than water) would only fill about 3.8 tablespoons.
you fill it up
You fill the glass up.
It depends on the size of each water droplet and the density of the fog. It is unlikely that the water droplets in a seven block fog would be enough to fill a half-full glass, as fog droplets are typically very small.
1 liter = 1,000 milliliters
If the glass has a hole in the bottom and you submerge it upside down in water, the water would enter the glass through the hole until the air pressure inside and outside the glass equalize. Once this happens, the water would stay at a level inside the glass equal to the height of the water outside the glass.
Water can fill the bottom of a glass because it flows easily and takes the shape of its container. Ice, on the other hand, is a solid with a fixed shape and volume, so it cannot fill the bottom of a glass. When water freezes into ice, it expands and retains its shape rather than conforming to the shape of the glass.
You would need 1000 milliliters of water to fill a one liter glass jar.