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:
eBay Community | eBay US Your eBay Community Find answers to pressing questions, connect with members, and get advice from expert sellers
Setting up accounts with gologin multilogin - eBay Suspended PayPal . . . I recently updated with a new desktop running windows 11 professional with the hope that using either gologin or multilogin would help me get some
Report eBay Technical Issues Your eBay Community Find answers to pressing questions, connect with members, and get advice from expert sellers
Paypal login HELP - eBay Suspended PayPal Limited Forums i dont have access to the phone number that i created my paypal account with and its asking "Keep your mobile number updated" so it can send
Announcements | eBay Community Get product and policy updates and need-to-know updates for your business
Ebay Suspension Suspended Accounts – Aspkin Your email and eBay login trigger cookies with eBay, that list you as a suspended user, and ban any eBay accounts on your network or accounts you have ever logged into
eBay Community eBay Seller Events | eBay US Your eBay Community Find answers to pressing questions, connect with members, and get advice from expert sellers
eBay Accounts for Sale - eBay Suspended PayPal Limited Forums eBay Accounts for Sale Unable to create your own eBay or PayPal accounts? Are you in a rush to start selling again? We have eBay and PayPal Account Sellers for you! + VCCs to verify your account (s)
APIs Feedback, Comments and Suggestions | eBay Community Your eBay Community Find answers to pressing questions, connect with members, and get advice from expert sellers
Banks - eBay Suspended PayPal Limited Forums The Following User Says Thank You to eBaysnightmare For This Useful Post: agent006140 (02-14-2025) eBay Suspended PayPal Limited Forums > Platform Discussions > eBay Discussion! > eBay Managed Payments « ebay MP and IBAN name check in EU | Delivery Not Confirmed Message Appearing Even Before Shipping »