How is the pressure of a gas related to its temperature at constant volume?

The pressure of a given amount of gas is directly proportional to its absolute temperature, provided that the volume does not change (Amontons’s law). The volume of a given gas sample is directly proportional to its absolute temperature at constant pressure (Charles’s law).

What happens to the density of a gas as it is heated?

When a substance is heated its volume increases and so the density decreases. In liquids and gases, as the temperature increases, volume increases and therefore density decreases considerably.

Which law is shown when a helium balloon expands when placed in warm water?

This causes the molecules to ‘spread out’ – a phenomenon called thermal expansion. Air molecules collide into the balloon with the same energy inside and outside the balloon. When the bottle is heated, the air molecules inside start moving faster.

How do I find the density of a gas?

PV = gRT/M, where P = pressure, V= volume, T = temperature, g = weight of the gas R = the ideal gas constant. This equation may be rearranged to give the density of the gas : r = g/V = PM/RT.

How are the pressure and temperature of a gas related?

Gay Lussac’s Law – states that the pressure of a given amount of gas held at constant volume is directly proportional to the Kelvin temperature. If you heat a gas you give the molecules more energy so they move faster. This means more impacts on the walls of the container and an increase in the pressure.

How do you find the temperature of a gas when given the pressure?

The equations describing these laws are special cases of the ideal gas law, PV = nRT, where P is the pressure of the gas, V is its volume, n is the number of moles of the gas, T is its kelvin temperature, and R is the ideal (universal) gas constant.

Which has maximum density?

An especially notable irregular maximum density is that of water, which reaches a density peak at 3.98 °C (39.16 °F). The density varies with temperature, but not linearly: as the temperature increases, the density rises to a peak at 3.98 °C (39.16 °F) and then decreases.

Which gases have the highest density?

The densest gas element is either radon (monatomic), xenon (which forms Xe2 rarely), or possibly Oganesson (element 118). Oganesson may, however, be a liquid at room temperature and pressure. Under ordinary conditions, the least dense element is hydrogen, while the densest element is either osmium or iridium.

What causes the density of a balloon to decrease?

The stronger outside air pressure compresses the balloon. As the balloon volume decreases, pressure inside the balloon increases. It eventually is able to balance the outside air pressure. If you warm air it will expand and density will decrease until the pressure inside and outside the parcel are equal.

What happens to the gas inside the balloon when the balloon was placed in the container of liquid nitrogen why does it happened?

An air-filled balloon will contract after contact with liquid nitrogen. Air is a mixure of gases including oxygen and nitrogen. These gases condense or change state from gas to liquid air when the balloon is cooled with the liquid nitrogen.

What is the density of helium at atmospheric pressure?

Density of Helium. Density of Helium is 0.1785g/cm 3. Typical densities of various substances are at atmospheric pressure. Density is defined as the mass per unit volume. It is an intensive property, which is mathematically defined as mass divided by volume: ρ = m/V

What is the valence of helium at room temperature?

Containers filled with helium gas at 5 to 10 K should be treated as though they contained liquid helium due to the large increase in pressure resulting from warming the gas to room temperature. While helium normally has a 0 valence, it seems to have a weak tendency to combine with certain other elements.

What is the unit of specific weight of helium?

Helium – Density and Specific Weight Density, ρ, has units typically [kg/m3] or [lb/ft3], and is defined by the ratio of the mass to the volume of a substance: ρ = m/V where m = mass, units typically [kg] or [lb]

What is the state of matter of helium?

It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. Its boiling point is the lowest among all the elements. Helium is a chemical element with atomic number 2 which means there are 2 protons in its nucleus.