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Combining Weight.

50 184

I 20

5193 616 652 89.6

Zn

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Zr

SPECIFIC GRAVITY OF GASES AND VAPOURS.
(1 litre of hydrogen at 0° C. and under a pressure of 760 m.m. of mercury, weighs o'0896 gramme = 1 crith.
1 litre of oxygen (c.w.=16) under the same circums. weighs 16 criths=0'0896 X 16=1'4336

grammes
1 litre of nitrogen (c.w.= 14)

APPENDIX B.

METRIC SYSTEM OF WEIGHTS AND MEASURES.

I metre = 39'37 inches
To metres = i decametre
100 metres =r hectometre
1000 metres = 1 kilometre

to metre = 1 decimetre
Tdo metre = 1 centimetre
jooo metre == 1 millimetre

I gramme = 15-43 grains
10 grammes = 1 decagramme
100 grammes = 1 hectogramme
1000 grammes = 1 kilogramme

Io gramme = 1 decigramme
Tdo gramme = 1 centigramme
Tobo gramme = 1 milligramme

I litre = 61'02 cubic inches, and

contains 1000 cubic centimetres.
1 litre of water at 40 C. weighs

1000 grammes.
I galion = 4'5434 litres.

APPENDIX C.

Vap urs.

Gases or
Com- Elementary
Gases.

14 criths
127 criths

=0'0896 X 14 = 12544 I litre of iodine vapour (c.w.= 127)

= 0.0896 X 127 = 1193792 1 litre of water vapour (m.w.= 18)

V = 9 criths = 0'0896x9=0'0864 1 litre of carbonic anhydride (m.w.= 44)

= 22 criths = 0'0896 X 22 = 1'9712 1 litre of ammonia gas (m.w.= 17)

= 8.5 criths=0'0896x8*5= 0·7616 litre of hydrochloric acid gas (m.w. = 36-5)

gol=18-25 criths=0'0896 X 18-25 =16352 1 litre of dry air

14'42 criths=1'2932

.

1

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