Tailandia

El buceo es un modo de buceo submarino en el que el buceador utiliza un aparato de respiración subacuático autónomo (scuba) que es completamente independiente del suministro de superficie, para respirar bajo el agua Los buzos llevan su propia fuente de gas respirable, generalmente aire comprimido, lo que les permite mayor independencia y libertad de movimiento que los buceadores de superficie, y mayor resistencia bajo el agua que los buzos que retienen la respiración. Los sistemas de buceo de circuito abierto descargan el gas respirable en el medio ambiente a medida que se exhala y consisten en uno o más cilindros de buceo que contienen gas respirable a alta presión que se suministra al buceador a través de un regulador.

Pueden incluir cilindros adicionales para extensión de rango, gas de descompresión o gas de respiración de emergencia. Los sistemas de buceo con rebreather de circuito cerrado o semicerrado permiten el reciclaje de los gases exhalados. El volumen de gas utilizado se reduce en comparación con el de circuito abierto, por lo que se puede utilizar un cilindro o cilindros más pequeños para una duración de inmersión equivalente. Los rebreathers extienden el tiempo de permanencia bajo el agua en comparación con el circuito abierto para el mismo consumo de gas; producen menos burbujas y menos ruido que los buzos de circuito abierto, lo que los hace atractivos para los buzos militares encubiertos para evitar la detección, los buzos científicos para evitar molestar a los animales marinos y los buzos de medios para evitar la interferencia de burbujas.

A safari is an overland journey, usually a trip by tourists in Africa. In the past, the trip was often a big-game hunt, but today, safaris are often to observe and photograph wildlife—or hiking and sightseeing, as well.

In 1836 William Cornwallis Harris led an expedition purely to observe and record wildlife and landscapes by the expedition’s members. Harris established the safari style of journey, starting with a not too strenuous rising at first light, an energetic day walking, an afternoon rest then concluding with a formal dinner and telling stories in the evening over drinks and tobacco. The hunting aspect traditionally associated with the safari is said to have its origins in the early 1800s in the region of Évora, Alentejo, where villagers got together to hunt wild boar and reclaim land for farming.

Tourism is travel for pleasure or business; also the theory and practice of touring, the business of attracting, accommodating, and entertaining tourists, and the business of operating tours. Tourism may be international, or within the traveller’s country. The World Tourism Organization defines tourism more generally, in terms which go “beyond the common perception of tourism as being limited to holiday activity only”, as people “traveling to and staying in places outside their usual environment for not more than one consecutive year for leisure, business and other purposes”.

Dedicated road bicycles have drop handlebars and multiple gears, although there are single and fixed gear varieties. Road bikes also use narrow, high-pressure tires to decrease rolling resistance, and tend to be somewhat lighter than other types of bicycle. The drop handlebars are often positioned lower than the saddle in order to put the rider in a more aerodynamic position. In an effort to become more aerodynamic, some riders have begun using aerobars.

And when aerobars where invented is unclear but they seem to date back to the early 1980s. The light weight and aerodynamics of a road bike allows this type of bicycle to be the second most efficient self-powered means of transportation, behind only recumbent bicycles due to the latter’s higher aerodynamic efficiency.

Mountain bikes fitted with slick or semi-slick are also popular for commuters. Though less efficient, the upright riding position allows the cyclist a better view of traffic, and they can also be readily fitted with mudguards, cargo racks and other accessories. Mountain bikes are usually ridden on unpaved roads and tracks but they are not to be confused with cyclocross bikes.