I would say strength as in weak or strong. Possibly intense if something was highly flavored.
Normally the liquid used is either a spirit or another form of alcohol, which is where they get their alternate name, the spirit level.
When a liquid is held in a vessel, the water adheres to the side of the vessel. So when the amount of liquid held by the vessel is less than the full amount the vessel will hold, the liquid level rises where it touches the vessel. It "sticks" to the side of the vessel hard enough to be above the top of the liquid. This is called a negative meniscus. When the level of the liquid is higher than the top of the vessel (but doesn't overflow the top due to the surface tension of the liquid), then there is a positive meniscus.
Apparently it does.
Liquid level gauges are used to show the level of liquid in a container. They are most often used to view the level of liquid in tanks and boilers in an industrial setting.
It's a liquid you add to food to give it a smoked flavor.
Liquid or powder? And what flavor?
That is too vague to be understood. You need to define whether "flavor" is liquid, granular or powder.
If the liquid is static or moving with a constant velocity, then liquid pressure at a particular level is constant.In case the liquid is in accelerated motion we will get variation in the liquid pressure at a particular level
reduction
Just add sugar
Pickled tofu is commonly used in small amounts together with its soaking liquid to flavor stir-fried or braised vegetable dishes.
Vanilla is found in a seed (of the vanilla orchid) called a vanilla bean. The flavor is extracted from the bean by soaking it in alcohol. The vanilla bean is solid, the flavoring- vanilla extract, is a liquid.