why the density of pure water is 1(no decimal number) ...i think the standard for mass is determined after the density of water is determined.Do you have any idea?
2006-08-10 02:26:49 · 5 answers · asked by pouli 2 in Science & Mathematics ➔ Physics
That is not exact.
The maximum density of pure water at a pressure of one standard atmosphere is 999.861kg·m-3; this occurs at a temperature of about 3.98 °C (277.13 K).
From 1901 to 1964, a litre was defined as exactly the volume of 1 kg of water at maximum density, and the maximum density of pure water was 1.000 000 kg·L-1 (now 0.999 972 kg·L-1). However, while that definition of the litre was in effect, just as it is now, the maximum density of pure water was 0.999 972 kg·dm-3. During that period students had to learn the esoteric fact that a cubic centimetre and a millilitre were slightly different volumes, with 1 mL = 1.000 028 cm³. (often stated as 1.000 027 cm³ in earlier literature).
2006-08-10 02:40:28 · answer #1 · answered by armirol 3 · 1⤊ 0⤋
Are you asking why the density of pure water is 1? By convention, that is to say by definition. When measuring anything there has to be a standard that defines that measurement. In the case of density, that standard is pure water. 1 milliliter of water (volume) just happens to have 1 gram of mass.
Since water is so universal to our planet and our society, it is a logical substance to use as a standard.
2006-08-10 09:38:37 · answer #2 · answered by sparc77 7 · 0⤊ 0⤋
Water was simply the substance that people wanted to use as a comparison point. So, they just gave it an arbitrary density of 1. This means that whenever you talk about the density of an object, it is always in comparison to water, and water in comparison with itself is 1.
2006-08-10 09:33:12 · answer #3 · answered by Dan Theman 4 · 0⤊ 0⤋
ththe density of water is one only because 1 litre of water weighs 1kg at room temp and standard atmospheric pressure. and not due to any convention and it is not arbitary. what the others are speaking about is known as relative density or specific gravity which is the density of a substance with respect to water
2006-08-10 09:54:39 · answer #4 · answered by keerthan 2 · 0⤊ 0⤋
becos physicist use water as the standard, and the rest of the solution are assessed based on the comparison of 'heaviness' with water.
So water vs water =1!
2006-08-10 09:31:39 · answer #5 · answered by biomedical_undergrad 2 · 0⤊ 0⤋