- published: 24 Jan 2017
- views: 3329
Wetting is the ability of a liquid to maintain contact with a solid surface, resulting from intermolecular interactions when the two are brought together. The degree of wetting (wettability) is determined by a force balance between adhesive and cohesive forces. Wetting deals with the three phases of materials: gas, liquid, and solid. It is now a center of attention in nanotechnology and nanoscience studies due to the advent of many nanomaterials in the past two decades (e.g. graphene,carbon nanotube).
Wetting is important in the bonding or adherence of two materials. Wetting and the surface forces that control wetting are also responsible for other related effects, including so-called capillary effects.
There are two types of wetting: non-reactive wetting and active wetting.
Adhesive forces between a liquid and solid cause a liquid drop to spread across the surface. Cohesive forces within the liquid cause the drop to ball up and avoid contact with the surface.
The contact angle (θ), as seen in Figure 1, is the angle at which the liquid–vapor interface meets the solid–liquid interface. The contact angle is determined by the result between adhesive and cohesive forces. As the tendency of a drop to spread out over a flat, solid surface increases, the contact angle decreases. Thus, the contact angle provides an inverse measure of wettability.
This happened to my own cousin when she was giving private lectures on nutrition and healthy eating - she simply wet herself while giving a talk. Niki is preparing her papers and totally forgets about the time. She drinks tea the whole afternoon and when she realizes her learners are already waiting for her she rushes to the room without visiting the toilet first. She is so desperate to pee that she even stops talking several times, her ability to focus is gone. And then suddenly she freezes and starts peeing her pants. Watch this video to find out what happened in the bathroom afterwards.
It's Vanessa's big day today, she has to go through a job interview today and hopes to get her dream job. But she has two problems. First of all she needs to pee and the pressure in her bladder is rising. Second, she can't find the address of the company. She also wears a sports bag because part of the interview is showing her physical abilities. Vanessa is in agony. She check the navigation in her smartphone and then even phones the company and asks how to get there. It's pretty obvious she has to find bathroom really quickly but it's not her lucky day today. When she finally arrives at the door and searches for the bell she pisses her pants. She collapses on the stairs and starts crying.
Came home a little too late!
Morgan has a date with her new boyfriend - they are about to meet in a forest park but he's late and Morgan really needs to pee. At one point she even decides to squat down near a tree but she suddenly sees her new love coming so she quickly stands up and pretends that nothing is happening. They go for a lovely afternoon walk but she's still very nervous and her bladder is absolutely bursting. Her new man is asking what's wrong but she's to shy to admit how desperate to pee she is. When this lovely couple arrives to a bench they stop and the guy wants to hug his new lady - and this is exactly the moment when something goes terribly wrong...
Vanessa wants to visit her friend in Prague but she lives in Rozvadov so it's quite a long trip. She buys drinks at a gas station and although she can feel some warning signs in her bladder she thinks she has everything under control and she will pee in her friend's flat. But after another hour of driving she is really desperate for pee. She hates public toilets so she misses another chance to pee before she gets to Prague. Soon she's holding her crotch and impatiently searching for the next gas station. Finally she stops and pees her pants a bit when getting out of the car. She's running towards the toilet door but it's locked (as is the common practice in this country). But it's too late to go inside and ask for keys...
I told you three stories of acceding Si have had
Rita is enjoying a lovely afternoon in Prague, she came here for a couple of days. She's having coffee and is so glad she had broken up with that annoying guy! After a while she pays for the beverages but forgets to go to the bathroom. She's really looking forward to sightseeing but she will be in serious trouble very soon. She's walking on the courtyard of the Prague castle and suddenly feels the need to pee. She's searching for public toilets and even asks a guy but he doesn't know either. She tries to use toilets in a luxury restaurant but they almost kick her out because she's not their guest and doesn't want to buy anything. Rita is trying to find a solution but it's too late. She pees her jeans on old castle stairs. Are you curious how she solves her situation? Watch this video...
Wet wet wet wet wet wet wet wet wet wet wet wet wet wet wet wet wet wet
This love is like a raging lion
It's a heart of gold
That's given you a place to go.
You try so hard to make it on your own
You've got to understand I'm making myself known.
Come back to the airwaves, burn the ashes
Raise the grave up to the sun.
Sing of Me, sing of My love
Like a bullet from a gun "SHOT" through the airwaves.
"BANG, BANG"
Raise the dead.
Sing of Me, sing of My love
Like a bullet from a gun.
It's time for me to bring the black back
And capture the songs and take them to the streets.
If we can sing it loud, we might just see it now
We've got to shake the world, we've got to lift our voice.