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A balanced scale, which compares the mass of one object with that of another.
kilos and/or grams
Binoculars
The best estimate for a pair of sneakers is 1 kilogram.
"Clic" magnetic glasses have a unique design where there is a magnet in the bridge of the pair of glasses which make the glasses separate at the bridge. They can be purchased on the Clic Magnetic Glasses website or on Amazon as well as major retailers such as Wal-Mart.
That would usually be expressed in grams.
the mass of an ice cube is best measured in grams using a balance.
A pair of scales.
A balanced scale, which compares the mass of one object with that of another.
To measure the mass of a stone a top pan balance is used
1 gram
Because they have a pair of lenses.
two pairs of glasses
The first pair of eyeglasses were invented in 1285. But That was only when the first pair of farsighted glasses were invented. The first pair of nearsighted glasses were invented in about 1430. Only higher class people could afford them. -00-
The best pair of 3D glasses that I have found are my 3D aviator glasses from Visual World Products. They have many styles... the aviators are great. (visualworldproducts.com)
You do not need to go to an optician to get reading glasses. They can be custom made for each individual person, but its always better to go to an optician because they new about glasses and are professionals
When you say "glasses", it is plural. A "glass" is one of the lenses. "Glasses" would refer to both of the lenses, and a "pair of glasses" doesn't mention anything about the frame, but it mentions the two lenses. The frame is the object that joins the two lenses so you don't have to wear contacts and so it can stay on your head. When you say "a pair of glasses", you are referring to the "pair of lenses", not the frame. The frame holding the two lenses makes us think that it is one object, when the word "glasses" refers only to the lenses, not the frame. That is why it is called "a pair of glasses".