Many natural materials are transparent, and many not. Water is transparent in the liquid phase, but when frozen, it may be white. Due to crystal reflections.
Oxygen is transparent as a gas, but a light blue as a liquid.
They just are - that is their natural property. Which we may or may not be able to explain.
It doesn't absorb any visible light and its index of refraction is similar enough to air that it doesn't have a very high reflectivity, so light passes through it.
Liquids, like water or milk, are measured in pints and quarts.
Yes, it is possible to dissolve liquids but it depends on which liquids you mix together. When two liquids dissolve when mixed (such as water and ethanol) they are called miscible. Sometimes liquids do not mix at all (like water and oil) but it really depends on polarity.
Reflections, like when you look in the water.
These terms are usually applied to descriptions of chemicals, particularly liquids. A synonym for clear is transparent, one can see through it. However something clear isn't necessarily colourless, a common mistake is chemistry class. A clear liquid - like apple juice - may have a yellow tinge to it, giving it a colour. Something clear AND colourless is both completely see-through and has no visible colour, like water.
Water, or liquids do not have a shape
vinegar
Not all liquids are flammable. Some liquids that are flammable are gasoline, alcohol, oil. Liquids like water are not flammable.
That depends. Some liquids (like water and alcohol, or water and vinegar) mix, some (like water and oil) don't.
Something salty
I wouldn't risk taking any pills to clear out your system. And if you're going to get drug tested, you shouldn't be smoking it anyways. The best way to clear your system safely is drinking. LOTS OF WATER AND CRANBERRY JUICE. Liquids, liquids, and some more liquids.
Only the few liquids that expand when they freeze like water. But yes, they can.
Red, Swollen, and possibly containing pus, blood, or clear seeping liquids.
Only waves in liquids.
Not always; tap water is clear but contains many dissolved ions.
Two miscible liquids are: Alcohol and water.Sorry if this isn't what you wanted.
Liquids with high viscosity flow slowly, like honey. Liquids with low viscosity flow quickly, like water and vinegar.
Heat can make water boil, like when you put a pot of water on the stove on high!