- published: 22 Nov 2015
- views: 849256
Dry ice, sometimes referred to as "Cardice" or as "card ice" (chiefly British English), is the solid form of carbon dioxide. It is used primarily as a cooling agent. Its advantages include lower temperature than that of water ice and not leaving any residue (other than incidental frost from moisture in the atmosphere). It is useful for preserving frozen foods, ice cream, etc., where mechanical cooling is unavailable.
Dry ice sublimates at −78.5 °C (−109.3 °F) at atmospheric pressure. This extreme cold makes the solid dangerous to handle without protection due to burns caused by freezing (frostbite). While generally nontoxic, the outgassing from it can cause asphyxiation due to displacement of oxygen in confined locations.
Dry ice is the solid form of carbon dioxide (chemical formula CO2), comprising two oxygen atoms bonded to a single carbon atom. It is colorless, odorless, non-flammable, and slightly acidic.
At temperatures below −56.4 °C (−69.5 °F) and pressures below 5.13 atm (the triple point), CO2 changes from a solid to a gas with no intervening liquid form, through a process called sublimation. The opposite process is called deposition, where CO2 changes from the gas to solid phase (dry ice). At atmospheric pressure, sublimation/deposition occurs at −78.5 °C (−109.3 °F).
Dry or dryness denotes a lack of water. It may also refer to
Ice is water frozen into the solid state. It can appear transparent or opaque bluish-white color, depending on the presence of impurities or air inclusions. The addition of other materials such as soil may further alter the appearance.
Ice appears in nature in forms of snowflakes, hail, icicles, glaciers, pack ice, and entire polar ice caps. It is an important component of the global climate, and plays an important role in the water cycle. Furthermore, ice has numerous cultural applications, from ice cooling of drinks to winter sports and the art of ice sculpting.
The molecules in solid ice may be arranged in different ways, called phases, depending on the temperature and pressure. Usually ice is the phase known as ice Ih, which is the most abundant of the varying solid phases on the Earth's surface. The most common phase transition to ice Ih occurs when liquid water is cooled below 0°C (273.15K, 32°F) at standard atmospheric pressure. It can also deposit from vapour with no intervening liquid phase, such as in the formation of frost.
Late last night I had a dream
And she was in it again
She and I were in the sky
Flyin' hand in hand
I woke up in a cold sweat
Wishing she was by my side
Praying that she'll dry the tears
Left on my face I've cried
Oh, I love her
Keep dreaming of her
Will I understand
If she wants to be my friend?
I'll send a letter to that girl
Asking her to by my own
But my pen is writing wrong
So I'll say it in a song
Oh, I love you more right now
More than I've ever loved before
Hear these words straight from these lips
I'll need you forever more
Oh, I love her
Keep dreaming of her
Will I understand
If she wants to be my friend?
Oh, I love her
Keep dreaming of her
Will I understand
If she wants to be my friend?
The means of pain that's in my heart
The means of pain that's in my heart
The means of pain that's in my heart
The means of pain that's in my heart
Late last night I had a dream
And she was in it again
She and I were in the sky
Flying hand in hand
I woke up in a cold sweat
Wishing she was by my side
Praying that she'll dry the tears
Left on my face I've cried
Oh, I love her
Keep dreaming of her
Will I understand
If she wants to be my friend?
Oh, I love her
Keep dreaming of her
Will I understand
If she wants to be my friend?
The means of pain that's in my heart
The means of pain that's in my heart
The means of pain that's in my heart