platina
n . 白金;铂
白金;铂
Platina \
Plat "
i *
na \,
n . [
Sp .
or NL .
See {
Platinum }.] (
Chem .)
Platinum .
[
1913 Webster ]
{
Platina mohr },
platinum black .
{
Platina yellow },
a pigment prepared from platinum .
[
1913 Webster ]
Platinum \
Plat "
i *
num \,
n . [
NL .,
fr .
Sp .
platina ,
from plata silver ,
LL .
plata a thin plate of metal .
See {
Plate },
and cf .
{
Platina }.] (
Chem .)
A metallic element of atomic number 78 ,
one of the noble metals ,
classed with silver and gold as a precious metal ,
occurring native or alloyed with other metals and also as the platinum arsenide (
sperrylite ).
It is a heavy tin -
white metal which is ductile and malleable ,
but very infusible (
melting point 1772 [
deg ]
C ),
and characterized by its resistance to strong chemical reagents .
It is used for crucibles in laboratory operations ,
as a catalyst ,
in jewelry ,
for stills for sulphuric acid ,
rarely for coin ,
and in the form of foil and wire for many purposes .
Specific gravity 21 .
5 .
Atomic weight 195 .
1 .
Symbol Pt .
Formerly called {
platina }.
[
1913 Webster PJC ]
{
Platinum black } (
Chem .),
a soft ,
dull black powder ,
consisting of finely divided metallic platinum obtained by reduction and precipitation from its solutions .
It absorbs oxygen to a high degree ,
and is employed as an oxidizer .
{
Platinum lamp } (
Elec .),
a kind of incandescent lamp of which the luminous medium is platinum .
See under {
Incandescent }.
{
Platinum metals } (
Chem .),
the group of metallic elements which in their chemical and physical properties resemble platinum .
These consist of the light platinum group ,
viz .,
rhodium ,
ruthenium ,
and palladium ,
whose specific gravities are about 12 ;
and the heavy platinum group ,
viz .,
osmium ,
iridium ,
and platinum ,
whose specific gravities are over 21 .
{
Platinum sponge } (
Chem .),
metallic platinum in a gray ,
porous ,
spongy form ,
obtained by reducing the double chloride of platinum and ammonium .
It absorbs oxygen ,
hydrogen ,
and certain other gases ,
to a high degree ,
and is employed as an agent in oxidizing .
[
1913 Webster ]
安装中文字典英文字典查询工具!
中文字典英文字典工具:
复制到剪贴板
英文字典中文字典相关资料:
F1 - The Official Home of Formula 1® Racing Your go-to source for the latest F1 news, video highlights, GP results, live timing, in-depth analysis and expert commentary
F1 Schedule 2026 - Official Calendar of Grand Prix Races United States FORMULA 1 MSC CRUISES UNITED STATES GRAND PRIX 2026 23 - 25 Oct ROUND 18
F1 Calendar | ESPN The complete 2026 F1 season schedule on ESPN Includes game times, TV listings and ticket information for all F1 games
F1 Calendar 2026 - Formula One Race Times and Dates Formula One Calendar for 2026 season with all F1 grand prix races, practice qualifying sessions Set reminders feature All world timezones Download or subscribe
F1 News, Drivers, Results - Formula 1 Live Online | Sky Sports Formula 1 on Sky Sports - get the latest F1 news, results, standings, videos and photos, plus watch live races in HD and read about top drivers
Monaco Grand Prix 2026: Where to watch the Formula 1 race today, TV . . . Monaco Grand Prix 2026: Where to watch the Formula 1 race today, TV schedule, how to stream, and more If you buy something through a link in this article, we may earn commission
Formula 1 on ESPN - Grand Prix Results, News and Standings Russell: Title in Antonelli's hands post Canada DNF Wolff backs Russell to 'forget, move on' from DNF Lewis: Ferrari 'moving mountains' to deliver P2 Max again hints at leaving F1 if '27 regs
F1 Schedule – Race Calendar Interactive Map Complete Formula 1 race schedule with dates and circuits on an interactive world map view
F1 Race Calendars | Full Schedule of F1 Races | F1 History A complete F1 calendar, list, schedule and dates and times for every practice, sprint, qualifying and race session on the F1 calendar
Complete F1 Schedule 2025 Calendar Grand Prix Sprints Check out this year's ️ F1 Schedule of the 2025 calendar and block appointments ⏰ to not miss any Grand Prix is Formula one's 75th season