Valve stem seals? Either you change the valve stem, or you change the valve core. Depends on where your air is leaking from. If it's the valve core, you simply take a valve core removal tool or pocket screwdriver with a valve core removal end (either one can be had cheaply at an auto parts store), uncscrew the old valve core out, insert the new valve core, and tighten it in. If you're replacing the entire valve stem, best to let a tire shop do this, as your tire will have to be dismounted, remounted, and balanced again.
Use a steam cleaner then dry the seals. It always works
Up to about 150 psig or so. Yes. Graphite is used for shaft seals on steam powered equipment.
Increase the gland steam pressure if air is leaking in. If gland steam is leaking out, replace the seals. If the leak is in the casing, repair or replace the damaged parts.
No. Steam is water vapor. Steam is formed by boiling water, which is a physical change.
The formation of steam from boiling water in a kettle is a physical change. It involves a phase change from liquid to gas without altering the chemical composition of the water molecules.
Yes, steam condensing on a mirror is a physical change. It involves the change of state from gas (steam) to liquid (water) without any chemical reaction taking place.
You heat it.
evaporation
The change from liquid water to steam is a physical change in the state of matter. Evaporation is the term for a liquid becoming a gas.
Steam is gas. Gaseous water to be exact.
You need to cool it down.
Water changing to steam is an example of a physical change, specifically a phase change from liquid to gas. This change is reversible as the steam can condense back into water under certain conditions.