The "big bang" theory is still relatively new. British astronomer Sir Fred Hoyle came up with the term "big bang" as a derogatory term in the 1950's, because Hoyle was a life-long believer in the "steady state" theory of the universe.
The density and temperature of the universe has been steadily declining for millions of years due to expansion and cooling of the Universe.
It has changed a lot
The density of what? Any metal, liquid, etc. will have the same density since density depends on mass and volume of the sample (not volume of the universe).
Some types of carbon increase in density as the universe ages. Many are unstable and may increase or decrease over time.
temperature and altitude
The solar core.
air density and temperature
Density: Mass/volume , so it is obious that density will changed with increase in temperature as volume is proportionaly changes with temperature so density will be decreases with increase in temperature. From this stand point we can say hot water has lower density then the water which is kept in room temperature. In 4'C water has higher density than other temperatures.
- modifying the temperature- modifying the pressure- modifying the volume
The density of what? Any metal, liquid, etc. will have the same density since density depends on mass and volume of the sample (not volume of the universe).
The speed of sound varies with various factors such as temperature,nature of the material,physical state of the substance,etc.
Density of a liquid is indirectly proportional to the temperature. When the temperature raises, the density of the liquid decreases. Therefor the temperature has an effect on water density.
Big Bang Cosmology contends -- and all observational evidence supports this idea -- that our Universe has been steadily growing less dense and at a lower overall temperature. For example, during the Quark Epoch (between 10^-12 and 10^-6 seconds after the end of Inflation), the temperature was 10^15 K; it's now down to less than 3 K.
Density is affected by both temperature and salinity. The colder the temperature and the saltier the substance, the greater the density.
if it is high the density is high so if the temperature is low the density is low.
The relationship between density and temperature is linear. In a thermal expansion, density will decrease and temperature increases and vice versa.
Relative density
The matter that existed since the Big Bang is expanding. A few decades ago, a "steady-state" theory was popular; according to it, matter was created as the Universe expanded, thus maintaining the matter density in the Universe constant. However, observational evidence did not support this theory.The matter that existed since the Big Bang is expanding. A few decades ago, a "steady-state" theory was popular; according to it, matter was created as the Universe expanded, thus maintaining the matter density in the Universe constant. However, observational evidence did not support this theory.The matter that existed since the Big Bang is expanding. A few decades ago, a "steady-state" theory was popular; according to it, matter was created as the Universe expanded, thus maintaining the matter density in the Universe constant. However, observational evidence did not support this theory.The matter that existed since the Big Bang is expanding. A few decades ago, a "steady-state" theory was popular; according to it, matter was created as the Universe expanded, thus maintaining the matter density in the Universe constant. However, observational evidence did not support this theory.
The mass is changed, the density is not changed.