Man's physical universe

xanabras

THE ABSORPTION OR EVOLUTION OF HEAT 227

never reached unless the pressure is sufficient to open the safety valves.

If the pressure above a liquid is increased sufficiently, no temperature

will be high enough to cause it to boil. The highest temperature at

3400—

- Oxy-acetylene Flame - Electric Arc

"Melting Point of Tungsten

2800—

— Oxy-hydrogen Flame

— Combustion of Charcoal in Liquid Oxygen

—Bunsen Burner

—Melting Point of Platinum

"""Industrial Furnaces

—Melting Point of Iron

—Melting Point of Copper

2000-

1870-

1755-

1700

1530-

1083-

810-

— Melting Point of Sodium Chloride

--Melting Point of Zinc

Boiling Point of Mercury

-Boiling Point of Water

-Freezing Point of Water

-Freezing Point of Mercury

-Polar Temperature

-Freezing Point of Carbon Dioxide

-Freezing Point of Alcohol

-Boiling Point of Liquid Oxygen

-Boiling Point of Liquid Air

-Boiling Point of Hydrogen

"Freezing Point of Hydrogen

^Freezing Point of Helium

"^Absolute Zero

V-y'

Fig. 71.

Some important high and low temperatures.

which a liquid will boil is known as its critical temperature. Above this

temperature the liquid and gaseous states become indistinguishable.

Certain gases, such as carbon dioxide, sulfur dioxide, and ammonia,

may be liquefied at ordinary temperatures; but, for a long time, air.

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