New York State Roads - I-87 Exit List. Interstate 87 is a major north-south road in New York state, connecting New York City, Albany, the Adirondacks, and MontrÃ©al. Like Interstate 90, it runs along the Thruway for part of its length and has three sets of exit numbers.
B2 [ C or U ] a substance in a form like air that is neither solid nor liquid: Oxygen, hydrogen, and nitrogen are all gases. poisonous/inflammable/toxic gas. A2 [ C or U ] a substance in a form like air that is used as a fuel for heating and cooking:
An inert gas is any gas that is not reactive with elements. Like the noble gases an inert gas is not necessarily elemental and are often compound gases. Like the noble gases the tendency for non-reactivity is due to the valence, the outermost electron shell, being complete in all the inert gases.