Name: B1U03 實驗室設備2 SRT (b1u03 labequipment2 srt)
Uploaded: 2025-09-10T14:03:13.000Z
Duration: 4 min 41 s

The main heat source in most chemistry labs is the Bunsen burner.

大多數化學實驗室的主要熱源是本生燈。

It produces an open gas flame burning at a high temperature.

情態副詞

There's always the danger of an accident if it's not used properly.

如果使用不當，總有發生事故的危險。

For example, it should never be used to heat volatile organic liquids that give off flammable vapors.

例如，絕不能用它來加熱揮發性有機液體，因為這些液體會釋放出易燃蒸汽。

These substances should be heated in a heating mantle or a steam bath in a hood.

這些物質應在加熱罩或蒸汽浴中加熱。

But for most other substances, a Bunsen burner is an ideal heat source when used properly.

但對於大多數其他物質來說，只要使用得當，本生燈是一種理想的熱源。

There are several types of Bunsen burners, but they all have the same basic parts.

本生燈有多種類型，但基本部件都相同。

The gas comes from an outlet on the lab bench.

氣體來自實驗臺上的一個出口。

A rubber hose fits over the tip and over a similar fitting on the Bunsen burner.

橡膠管套在噴嘴上，再套在本生燈上的類似接頭上。

Most burners have a valve at the bottom to control the flow of gas.

大多數燃燒器底部都有一個閥門，用於控制燃氣流量。

Air inlets control the amount of oxygen in the flame.

進氣口可控制火焰中的氧氣量。

A wingtop can be placed on the burner to spread the flame out.

可以在燃燒器上放置一個翼頂，使火焰散開。

There are several important rules to follow to use a Bunsen burner safely.

安全使用本生燈需要遵守幾條重要規則。

首先，檢查氣體軟管是否有裂縫。

如果發現任何問題，請更換新軟管。

Make sure the hose fits securely on the gas valve and on the Bunsen burner.

確保軟管牢固地安裝在燃氣閥和本生燈上。

The gas valve at the bottom of the burner should be open.

You can light a Bunsen burner with a striker or a match.

您可以用打火機或火柴點燃本生燈。

Open the gas line valve and light the burner.

If the flame is properly adjusted, you can place the burner under your setup.

如果火焰調整得當，您就可以將燃燒器放在設備下面。

Opening the air holes lets in more oxygen for combustion.

打開氣孔可以讓更多氧氣進入燃燒。

Adjust the bottom valve if the flame is too large or small.

如果火焰過大或過小，請調節底部閥門。

The flame should be blue with a lighter inner cone.

The tip of the inner cone is the hottest part of the flame.

內錐體的頂端是火焰最熱的部分。

If the flame begins to sputter or flare, turn the gas off immediately.

如果火焰開始濺射或燃燒，請立即關閉煤氣。

Also turn the gas off immediately if the flame goes out.

如果火焰熄滅，也要立即關閉煤氣。

Flat-bottomed containers are normally heated on a wire screen on a ring stand.

平底容器通常在環形支架上的金屬絲網上加熱。

Erlenmeyer flasks and other narrow-necked containers should be secured to the stand with a clamp.

應使用夾子將埃倫邁耶燒瓶和其他窄口容器固定在支架上。

Test tubes can be heated in a water bath.

The water bath transfers heat slowly and evenly to the test tube and helps keep it from boiling over.

水浴可以緩慢而均勻地將熱量傳遞到試管中，防止試管沸騰。

You can also heat a test tube directly in the flame.

您也可以直接在火焰中加熱試管。

Hold it at an angle while moving it back and forth to distribute the heat evenly.

在來回移動時保持一定角度，以便均勻分佈熱量。

Aim it away from yourself and your neighbors.  In case it boils over.

把它對準遠離自己和鄰居的地方。  以防沸騰。

A boiling liquid changes to gas, which must be able to escape.

沸騰的液體會變成氣體，而氣體必須能夠逸出。

Gas can't escape from a closed container and the pressure that builds up can burst it.

氣體無法從密閉的容器中逸出，積聚的壓力會使容器破裂。

Be extra careful when working with heated equipment.

Hold hot glassware in beaker tongs, never your hands.

用燒杯夾夾熱玻璃器皿，切勿用手。

Remember that the wire screen and ring stand are also hot.

記住，絲網和環形支架也是熱的。

If you don't have tongs, protect your hands with gloves designed for hot glassware.

如果沒有夾子，可以戴上專為熱玻璃器皿設計的手套來保護雙手。

Handle everything as if it's hot if you've been using a Bunsen burner.

如果您使用的是本生燈，則要把所有東西都當做燙手的東西來處理。

Glass and metal look the same when hot as they do when they're cold.

玻璃和金屬在熱的時候和冷的時候看起來是一樣的。