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www.reference.com/world-view/toilet-whistle-1f85e58af6a489a0

A whistling toilet is caused when the fill valve does not shut completely. If there is a gap, water leaks into the tank, causing the valve to vibrate. This is often caused by a dry or deteriorated ballcock valve.

www.reference.com/article/whistle-lips-6756ddc2ff749660

Closing the lips to form an "O" shape is the first step in whistling. The tongue should be against the ridge of the mouth's roof, and the lips should be tight. Experiment with the mouth, but maintain the whistling position. Wet lips and blow slowly.

www.reference.com/world-view/car-make-whistling-noise-68e75c958d0fdd30

While whistling noises in a car are due to several different problems, a vacuum leak is one common reason for this issue. Vacuum leaks also cause the car to run rough and stall. Worn, broken or cracked vacuum hoses are a common source of the leak, according to 2CarPros.com.

www.reference.com/article/wolf-whistle-ea073a02886a2ff9

Wolf whistling requires practice and patience. The goal is to make a high-pitched whistle that can be heard from afar. Wash your hands before placing fingers in the mouth.

www.reference.com/article/employee-whistle-blowing-8c239d9821f6f48

Employee whistle blowing is when an employee of a government agency or private enterprise discloses to the public or to an authority information about an illegal or unethical activity being perpetrated within the organization. Whistle blowers typically expose corruption, malfeasance or mismanagement

www.reference.com/article/use-shepherd-s-whistle-c30c13e211cb79e2

Using a shepherd's whistle to give commands to a sheepdog allows you to communicate over longer distances than using voice commands. Learn how to use a shepherd's whistle with these simple steps. Make sure to have a shepherd's whistle on hand.

www.reference.com/article/pitch-perfect-2-come-out-29099c4445c826e2

The official release date for "Pitch Perfect 2" was May 15, 2015. The Blu-ray/DVD release of "Pitch Perfect 2" is scheduled for Sept. 22, 2015.

www.reference.com/world-view/car-whistle-accelerate-b8aa3b6bd32215d0

Whistling noises that occur when accelerating a vehicle are often due to vacuum leaks under the hood. If a vacuum leak is the cause, the car is likely to make the same noise upon pressing the accelerator when the vehicle is idling.

www.reference.com/article/fireworks-whistle-1064fd61d97876e8

Whistling fireworks require two components: an explosive mixture that makes a sound when it burns and an empty portion of the rocket tube to act as a resonance chamber. The gas released creates the noise, while the chamber allows the sound waves to build on each other to earsplitting volume.

www.reference.com/science/pitch-sound-446bccfe0fc3e72a

The pitch of a sound is the ear and brain interpreting the frequency of the sound. When there is a high frequency, the ear interprets the sound as a higher pitch, and when the frequency is low, the ear hears a low pitch. Pitch has been standardized and uses "cents" as a unit of measurement.