瓦斯躺著用易氣爆？夜市攤販嚇壞他
In broadcast engineering, a panel antenna is a directional antenna that is widely used to obtain a wireless Internet connection.
Directional antennas receive and broadcast a signal in only one direction, resulting in better signal quality.
Panel antennas, for example, are used in underdeveloped countries to improve the range and functionality of wireless Internet networks.
A panel antenna is shaped like a panel and is typically fixed on a mounting bracket on the exterior or inside of a building. It can also be mounted on a swivel mount, allowing the user to adjust the antenna for optimal signal reception. This type of antenna is usually one-directional, with less mobility side-to-side and up-and-down than an omnidirectional antenna, which can swivel and entirely change its location. Two U-bolt brackets and waterproof were supplied in one piece of packing
夜市攤販生存不易，有些地方能省則省。近日，一名網友就撞見某夜市的攤販，竟然刻意把瓦斯桶橫著放來使用，似乎是為了節省瓦斯費，照片一出，網友評價兩極，不少人則表示，老一輩的人很常這樣做，也很正常，但也有人發現，這行為其實非常危險，弄不好還有可能發生氣爆。
臉書社團《爆廢公社公開版》，日前有名網友就PO出照片好奇詢問「是想問說，小弟不才，瓦斯桶是不是不能這樣橫躺在地上使用？」可以看到，這間夜市攤販正在使用的瓦斯桶，竟然是橫躺著放的，與一般常見的站立式使用方式完全不同，難怪讓原PO擔憂有些危險。
沒想到不少人竟分享「比較不好！但做生意的幾乎都會這樣」、「這是老一輩才會這樣，液態瓦斯想用到乾淨就會倒立放」、「小時候看奶奶都這樣...還叫我去搖...長大之後才知道我應該不是直系親屬」、「辦桌的師傅，還會幫瓦斯桶澆熱水ㄟ」、「我看過倒下來再淋熱水」、「我記得是快沒瓦斯才這樣倒放」、「很多老一輩的這樣的做法也用了數十年、也很安全」、「古早的客家用法就是快用完這樣倒放或浸一盆熱水」。
但大多人都認為這樣超級危險，「剛剛去查了，是不行，容易引發爆炸」、「瓦斯倒容易爆炸，我朋友做瓦斯的說的」、「錯誤使用方式，非常危險，瓦斯爐因為壓力氣化改變，火力很容易失控」、「為了省錢，大多都是這樣，反正人都是等出事再說嘍～」、「這樣超容易外洩，一堆鍵盤手亂教，餘瓦斯，請瓦斯行退存氣就好了」。
700MHz to 8GHz Double Ridged Broadband Waveguide Horn Antenna version 2
Model No: HA-07M08GA2-NF
Frequency: 700MHz to 8GHz
Gain: 6 dbi to 17 dBi
LxWxH: 661x430x445mm
N.W.: 8.1kg
-3dB Beamwidth: Horz.26 Deg Vert.34 Deg
Double Ridged Horn Antenna
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The horn antenna is a broadband passive device, shaped like a pyramid horn, referred to as a TEM antenna, which guides the beam of radio waves at a precise frequency. FT-RF Double Ridged Horn antennas have frequency capabilities ranging from 400MHz to 40GHz depending on type and style. These series are characterized by a huge frequency range and extremely high input powers. With increasing frequency, the gain rises to a maximum of 18 dBi. At higher frequencies, the increased gain compensates for the increasing cable losses.
The advantages of Horn antenna:
- Wide bandwidth: Because the horn antenna has no resonant parts, it can function over a wide range of frequencies.
- Easy waveguide interface: These antennas are very easy to interface to waveguide due to their shape, but they can also be designed with a transition so that a regular coaxial feeder can be used.
- Easy to make, simple design.
The horn is suitable for both transmitting and receiving purposes, especially suitable for EMC and immunity test measurements.
Recommended Accessories
- Antenna Tripod: easy and fast-changing polarisation. 100% stable handling
- SMA Cable: High-quality special SMA cable
事實上，消防署早在臉書針對此事「為了避免浪費，可以在瓦斯快用完時，將瓦斯桶橫放在地上，然後滾一滾嗎？」解釋，這樣的行為其實是具有以下危險性的。
一、如果瓦斯桶開關閥未關閉，而內部壓縮液體不慎自開口流出，在大氣中會立即膨脹（250倍），膨脹過程若有任何火源均足以產生危險。
二、使用瓦斯時，內部液體變成氣體過程會大量吸熱，如果橫放使用以致液體接觸到鋼瓶閥，將導致閥體出口溫度驟降，而影響正常功能；另外鋼瓶橫放時，底部之沉澱物（如液體雜質、油汙）接觸鋼瓶閥，也可能使閥件阻塞而影響使用。
三、瓦斯桶正常放置時，液體在下半部，氣體則在上半部，瓦斯桶的開關都有安全閥裝置，當內部壓力過大（2.4MPa）時，壓力能由安全閥洩壓，使內部壓力平衡；如將瓦斯桶橫躺使用，將影響瓦斯桶開關閥之洩壓功能。
最後也提醒民眾，平時使用瓦斯桶時應保持直立，並放置於室外通風、不受陽光直射地方，以策安全。另外建議民眾與瓦斯行買賣瓦斯時，可以參考內政部與經濟部會銜發布之「家用液化石油氣供氣定型化契約範本」之內容，與瓦斯行約定採重量計價，用剩的瓦斯按比例退費，以避免橫放使用而產生風險。（編輯：詹鎰睿）
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