388 Dr. Ure’s new experimental researches 
Table of experimental results on the latent heat of different 
vapours. 
200 gr. of water distilled, raised 32340 gr. 
water from 
- 
42°.5 to 49 a 
200 gr. alcohol, spec, gravity 0.825 
- 
42 
to 45 
200 
gr. sulphuric ether ; boiling point 
112° 
42 
to 44 
200 
gr. oil of turpentine 
- 
42 
to 43.5 
200 
gr. petroleum 
- 
42.5 
to 44 
200 
gr. nitric acid. spec. grav. 1.494. 
boiling 
point 165° 
- 
42 
to 45.5 
200 
gr. liquid ammonia, sp. gr. 0.978 
- 
42 
to 47.5 
200 gr. vinegar. sp. gr. 1.007 - 42.5 to 48.5 
Calculation from the above table of the specific or latent heats 
of the vapours. 
1st, Water. ~~ — 161.7 = the number of grains of 
water contained in the refrigeratory to one of steam. This 
proportion is constant for all the vapours. 
From 42°.5 to 212 0 there are i6g.°5 ; one half of which 
= 84°.75, or in round numbers 84% is the rise of temperature 
which would be produced by adding to water at 42°.5 its own 
weight of boiling water; and — 0.52, is the elevation 
which 200 gr. would occasion on 32340 grains. 
The water was however in reality heated 6j degrees, or 
from 42°.5 to 49°. The difference, 6°. 5 — o°.52 = 
shows the quantity of heat added to each of the 161.7 parts 
beyond what the same weight of boiling water would have 
communicated. 
