PPI may refer to:
Dots per inch (DPI, or dpi) is a measure of spatial printing or video dot density, in particular the number of individual dots that can be placed in a line within the span of 1 inch (2.54 cm).
Monitors do not have dots, but do have pixels; the closely related concept for monitors and images is pixels per inch or PPI. Many resources, including the Android developer guide, will use the term DPI interchangeably with PPI, however.
Old CRT type video displays were almost universally rated in dot pitch, which refers to the spacing between the sub-pixel red, green and blue dots which made up the pixels themselves. Monitor manufacturers used the term "dot trio pitch", the measurement of the distance between the centers of adjacent groups of three dots/rectangles/squares on the CRT screen. Monitors commonly used dot pitches of 0.39, 0.33, 0.32, 0.29, 0.27, 0.25, or 0.22 millimetres [mm] (0.0087 in).
LCD monitors have a trio of sub pixels, which are more easily measured.
In chemistry, pyrophosphate is a phosphorus oxyanion. Compounds such as salts and esters are also called pyrophosphates. The group is also called diphosphate or dipolyphosphate, although this should not be confused with two phosphates. As a food additive, diphosphates are known as E450. A number of hydrogen pyrophosphates also exist, such as Na2H2P2O7, as well as the normal pyrophosphates.
Pyrophosphates were originally prepared by heating phosphates (pyro from the Greek, meaning "fire"). They generally exhibit the highest solubilities among the phosphates; moreover, they are good complexing agents for metal ions (such as calcium and many transition metals) and have many uses in industrial chemistry. Pyrophosphate is the first member of an entire series of polyphosphates.
The term pyrophosphate is also the name of esters formed by the condensation of a phosphorylated biological compound with inorganic phosphate, as for dimethylallyl pyrophosphate. This bond is also referred to as a high-energy phosphate bond.
Tomorrow's coming 'round
A hair-pin curve in the road
She's got a run in her stocking
And she's missing the heel of her shoe
Got up this morning rolled out of bed
I spilled a diet coke
Called my mother said, "Hi"
What I meant to say was, "Why is your life a joke?"
Then, I went down to that ugly bar and
I clicked my heels three times just like you said
And I climbed that road to your empty house
The anticipation was a turn on
But you let me down
'Coz, I stood on that empty street alone
I said, "I'm ready for my close up now, Mr. Demille"
I waited for the light, but it never shone
Well I wonder what you do with that expensive piece of land
That overlooks a billion years of history
I have a sneaking suspicion, you will never understand
Hey maybe I'll see you down by the Rocky and Bullwinkle
And we can talk to that charlatan psychic
And she can paint a prettier picture of your future
'Coz that day in my life, that day in my life
I dreamt tomorrow, had a prettier face
I dreamt tomorrow, would have better things to say
Than, "You look like shit, what's your problem, bitch?
You're legs feel like sandpaper, you can't do anything right"
'Coz that day, never should have taken place
'Coz this day, in my life still cannot explain
Why I listened in the first place to you?
Oh yeah, something else
I hope one day you call up your father
And you have the guts to tell him, how he hurt you
And he made you hurt another