Because the pressure that is inflated on the gas which is highly inflammable multiplies on the volume of the gas.
what is the purpose of a heated wire circuit
Neither. Volume is independent of mass. Effectively, if you increase the volume of a substance you are moving the particles that comprise that substance apart. Eventually, you would have a gas which expands to fill the volume of its container.
Given that the container is "rigid" the size of the container holding the gas cannot change. Since the volume of the container remains constant, so too does the volume of the gas. The pressure however will increase.
A solid or liquid would not change in density because the volume would not change. The density of a gas would increase when cooled and decrease when heated provided the volume is allowed to change as a function of temperature. However, density of a gas is generally not measured because it is not a useful metric to use.* * * * *That is a rubbish answer.Almost all solids or liquids expand when heated. (Pure water under "normal" circumstances has an anomalous phase between 0 and 4 deg C). So heating will increase the volume thereby decrease the density.
This is because when heat is applied to particles, they gain energy, therefore they travel faster and space out. The volume will increase though the density will decrease. So matter will always expand when exposed to heat.
The volume increase.
Expansion.
When a substance is heated it's volume will increase.
it increase as a result of pressure generated from the heat
the volume of a solid this that humans do to warm up
The volume would increase as the pressure of the expanding air increases.
When steel (or indeed anything) is heated its mass does not change. Volume is altered by cooling and heating. In this case the volume of the steel would increase.
The kinetic energy of the particles inside the balloon increase. This then expands the volume of the balloon.
Because the gas inside expands with the heat
Because of the Brownian motion inside the water.
Perhaps coincidentally, that physical change is called "expansion".
The volume of air in a balloon being gently heated will increase and that is call Charles Law. Jacques Charles formulated this gas law in the 1780's. As absolute temperature increases, the volume of the gas also increases in proportion.